// bereken waarde

function IsNumeric(strString)
{
	var strValidChars = "0123456789.";
	var strChar;
	var blnResult = true;
	
	if (strString.length == 0) return false;

	for (i = 0; i < strString.length && blnResult == true; i++)
	   {
	   strChar = strString.charAt(i);
	   if (strValidChars.indexOf(strChar) == -1)
		  {
		  blnResult = false;
		  }
	   }
	return blnResult;
}

function view(waarde, kater)
{
	if((form1.vraagrpijs.value != "") && (form1.aankoopprijs.value != ""))
	{
		form1.rendement.value = waarde.toFixed(2);
		form1.kater.value = kater.toFixed(2);
	}
}

function bereken(waarde)
{

	if(IsNumeric(form1.vraagrpijs.value) == true)
	{
		form1.rendement.value = form1.aankoopprijs.value;
		var nummer1 = 1;
	}
	if(IsNumeric(form1.aankoopprijs.value) == true)
	{
		form1.rendement.value = form1.aankoopprijs.value;
		var nummer2 = 1;
	}

	var variabele1 = parseInt(form1.vraagrpijs.value);
	var variabele2 = parseInt(form1.aankoopprijs.value);

	var som = variabele1 - variabele2;
	
	kater = som * 0.2;
	som = som * 0.8;
	
	
	if((nummer1 == 1) && (nummer2 == 1))
	{
	
		if((form1.vraagrpijs.value != "") && (form1.aankoopprijs.value == ""))
		{
			form1.rendement.value = "";
		}
		else 
		{
			if((form1.vraagrpijs.value == "") && (form1.aankoopprijs.value != ""))
			{
				form1.rendement.value = "";
			}
			else
			{
				view(som, kater)
			}
	
		}
		
	} else
	{
		view(0, 0)
	}

}

// fade image en random

var fadeimages=new Array()

fadeimages[0]=["/img/template/top_sfeer01.jpg", "", ""] //plain image syntax

fadeimages[1]=["/img/template/top_sfeer02.jpg", "", ""] //plain image syntax

fadeimages[2]=["/img/template/top_sfeer03.jpg", "", ""] //plain image syntax

fadeimages[3]=["/img/template/top_sfeer04.jpg", "", ""] //plain image syntax

fadeimages[4]=["/img/template/top_sfeer05.jpg", "", ""] //plain image syntax

fadeimages[5]=["/img/template/top_sfeer06.jpg", "", ""] //plain image syntax

fadeimages[6]=["/img/template/top_sfeer07.jpg", "", ""] //plain image syntax


var fadebgcolor=""


var fadearray=new Array() //array to cache fadeshow instances

var fadeclear=new Array() //array to cache corresponding clearinterval pointers

 

var dom=(document.getElementById) //modern dom browsers

var iebrowser=document.all


function fadeshow(theimages, fadewidth, fadeheight, borderwidth, delay, pause, displayorder){


            this.pausecheck=pause

            this.mouseovercheck=0

            this.delay=delay

            this.degree=10 //initial opacity degree (10%)

            this.curimageindex=0

            this.nextimageindex=1
 

            fadearray[fadearray.length]=this


            this.slideshowid=fadearray.length-1

            this.canvasbase="canvas"+this.slideshowid

            this.curcanvas=this.canvasbase+"_0"

            if (typeof displayorder!="undefined")

            theimages.sort(function() {return 0.5 - Math.random();}) //thanks to Mike (aka Mwinter) :)

            this.theimages=theimages

            this.imageborder=parseInt(borderwidth)

            this.postimages=new Array() //preload images

            

            for (p=0;p<theimages.length;p++)

            {

                        this.postimages[p]=new Image()

                        this.postimages[p].src=theimages[p][0]

            }


            var fadewidth=fadewidth+this.imageborder*2

            var fadeheight=fadeheight+this.imageborder*2

             

            if (iebrowser&&dom||dom) //if IE5+ or modern browsers (ie: Firefox)

                        document.write('<div id="master'+this.slideshowid+'" style="position:relative;width:'+fadewidth+'px;height:'+fadeheight+'px;overflow:hidden;"><div id="'+this.canvasbase+'_0" style="position:absolute;width:'+fadewidth+'px;height:'+fadeheight+'px;top:0;left:0;filter:progid:DXImageTransform.Microsoft.alpha(opacity=10);-moz-opacity:10;-khtml-opacity:10;background-color:'+fadebgcolor+'"></div><div id="'+this.canvasbase+'_1" style="position:absolute;width:'+fadewidth+'px;height:'+fadeheight+'px;top:0;left:0;filter:progid:DXImageTransform.Microsoft.alpha(opacity=10);-moz-opacity:10;background-color:'+fadebgcolor+'"></div></div>')

            else

                        document.write('<div><img name="defaultslide'+this.slideshowid+'" src="'+this.postimages[0].src+'"></div>')

             

            if (iebrowser&&dom||dom) //if IE5+ or modern browsers such as Firefox

                        this.startit()

            else{

                        this.curimageindex++

                        setInterval("fadearray["+this.slideshowid+"].rotateimage()", this.delay)

            }

}

function fadepic(obj){

            if (obj.degree<100)

            {

                        obj.degree+=10

                        if (obj.tempobj.filters&&obj.tempobj.filters[0])

                                   {

                                   if (typeof obj.tempobj.filters[0].opacity=="number") //if IE6+

                                               obj.tempobj.filters[0].opacity=obj.degree

                                   else //else if IE5.5-

                                               obj.tempobj.style.filter="alpha(opacity="+obj.degree+")"

                                   }

                        else if (obj.tempobj.style.MozOpacity)

                                   obj.tempobj.style.MozOpacity=obj.degree/101

                        else if (obj.tempobj.style.KhtmlOpacity)

                                   obj.tempobj.style.KhtmlOpacity=obj.degree/100

                        } else

                        {

                        clearInterval(fadeclear[obj.slideshowid])

                        obj.nextcanvas=(obj.curcanvas==obj.canvasbase+"_0")? obj.canvasbase+"_0" : obj.canvasbase+"_1"

                        obj.tempobj=iebrowser? iebrowser[obj.nextcanvas] : document.getElementById(obj.nextcanvas)

                        obj.populateslide(obj.tempobj, obj.nextimageindex)

                        obj.nextimageindex=(obj.nextimageindex<obj.postimages.length-1)? obj.nextimageindex+1 : 0

                        setTimeout("fadearray["+obj.slideshowid+"].rotateimage()", obj.delay)

                        }

            }
			
            fadeshow.prototype.populateslide=function(picobj, picindex){

            var slideHTML=""

            if (this.theimages[picindex][1]!="") //if associated link exists for image

            slideHTML='<a href="'+this.theimages[picindex][1]+'" target="'+this.theimages[picindex][2]+'">'

            slideHTML+='<img src="'+this.postimages[picindex].src+'" border="'+this.imageborder+'px">'

            if (this.theimages[picindex][1]!="") //if associated link exists for image

            slideHTML+='</a>'

            picobj.innerHTML=slideHTML

}

fadeshow.prototype.rotateimage=function()

{
            if (this.pausecheck==1) //if pause onMouseover enabled, cache object

                        var cacheobj=this

                        if (this.mouseovercheck==1)

                                   setTimeout(function(){cacheobj.rotateimage()}, 100)

                        else if (iebrowser&&dom||dom)

                        {
                                   this.resetit()

                                   var crossobj=this.tempobj=iebrowser? iebrowser[this.curcanvas] : document.getElementById(this.curcanvas)

                                   crossobj.style.zIndex++

                                   fadeclear[this.slideshowid]=setInterval("fadepic(fadearray["+this.slideshowid+"])",50)

                                   this.curcanvas=(this.curcanvas==this.canvasbase+"_0")? this.canvasbase+"_1" : this.canvasbase+"_0"

                        } else

                        {
                                   var ns4imgobj=document.images['defaultslide'+this.slideshowid]

                                   ns4imgobj.src=this.postimages[this.curimageindex].src
                        }

            this.curimageindex=(this.curimageindex<this.postimages.length-1)? this.curimageindex+1 : 0
}

fadeshow.prototype.resetit=function()

{

            this.degree=10

            var crossobj=iebrowser? iebrowser[this.curcanvas] : document.getElementById(this.curcanvas)

            if (crossobj.filters&&crossobj.filters[0])

            {

                        if (typeof crossobj.filters[0].opacity=="number") //if IE6+

                                   crossobj.filters(0).opacity=this.degree

                        else //else if IE5.5-

                                   crossobj.style.filter="alpha(opacity="+this.degree+")"

                        }

                        else if (crossobj.style.MozOpacity)

                                   crossobj.style.MozOpacity=this.degree/101

                        else if (crossobj.style.KhtmlOpacity)

            crossobj.style.KhtmlOpacity=obj.degree/100

}

fadeshow.prototype.startit=function(){

            var crossobj=iebrowser? iebrowser[this.curcanvas] : document.getElementById(this.curcanvas)

            this.populateslide(crossobj, this.curimageindex)

            if (this.pausecheck==1){ //IF SLIDESHOW SHOULD PAUSE ONMOUSEOVER

                        var cacheobj=this

                        var crossobjcontainer=iebrowser? iebrowser["master"+this.slideshowid] : document.getElementById("master"+this.slideshowid)

                        crossobjcontainer.onmouseover=function(){cacheobj.mouseovercheck=1}

                        crossobjcontainer.onmouseout=function(){cacheobj.mouseovercheck=0}

            }

            this.rotateimage()

}