var aryImages = new Array(2);

	  aryImages[0] = "images/blauw_knopje.gif";
	  aryImages[1] = "images/wit_knopje.gif";
	  
  for (i=0; i < aryImages.length; i++) 
  {
    var preload = new Image();
    preload.src = aryImages[i];
  }
  //function swap(name,imgIndex) { 
  	//document[name].src = aryImages[imgIndex]; 
  //}
      
  function swap(name,imgIndex) 
  { 
		curmenu='';
		  	
  	if(document.getElementById('menu')) curmenu=document.getElementById('menu').value;
		if(name=="img"+curmenu)
		{
			document[name].src = aryImages[1]; 
			isset=1;
		}
		else
		{
	  	document[name].src = aryImages[imgIndex]; 
		}
  }

var path="";
var arrimg=new Array();
var curindex=0;

function init()
{
	path=document.getElementById('menu').value.toLowerCase()+"/";	
	//alert(document.getElementById('menu').value);
	eval("arrimg=arr"+document.getElementById('menu').value);
	var rand_no = Math.random();
	curindex=parseInt(rand_no*arrimg.length);
	//setImg(curindex);
	//alert(arrimg.length);
}

function nextImg()
{
	//alert(arrimg.length);
	if(arrimg.length)
	{
		curindex++;
		if(curindex>=arrimg.length) curindex=0;
		setImg(curindex);
	}
	//alert("next");
	//alert(path);
}

function setImg(index)
{
	//alert('setImg');
	if(document.getElementById('plaatjerechts'))
	{
		//alert(path+arrimg[index]);
		document.getElementById('plaatjerechts').src=path+arrimg[index];
	}	
}

function prevImg()
{
	if(arrimg.length)
	{
		curindex--;
		if(curindex<0) curindex=arrimg.length-1;
		setImg(curindex);
	}
	//alert("priv");
}


function check(formulier)                               
{                                                       
	var v1=formulier.Bedrijfsnaam.value;	//alert(v1);            
	var v2=formulier.Contactpersoon.value;	//alert(v2);            
	var v6=formulier.Telefoonnummer.value;	//alert(v6);            
	var v7=formulier.mail.value;	//alert(v7);            
                                                        
	if (!v1 && !v2)                                       
	{                                                     
	alert("Vul Bedrijfsnaam of Contactpersoon in.");      
	return false;                                         
	}                                                     
	else if (!v6 && !v7)                                  
	{                                                     
	alert("Vul Telefoonnummer of Email in.");             
	return false;                                          
	}  
	return true;                                                   
}