var current=0;
function klik(i){
	var i=i.substr(4,1);
	var dropdown=document.forms[0]["regio"];
	dropdown.selectedIndex=i;
	swap_image(i);
	current=i;
}
function hover(i){
	swap_image(i.substr(4,1));
}
function out(){
	swap_image(current);
}
function swap_image(i){
	if(i==0)i="";
	document.images["kaart"].src="./images/kaart"+i+".gif";
}
function swap(i){
	current=i;
	swap_image(i);
}
function preload_imgs(){
	for(var i=1;i<=6;i++){
		var img1=new Image();
		img1.src="./images/kaart"+i+".gif";
	}
}
function checkform(){
	var fields=new Array(4);
	fields[0]="regio";
	fields[1]="status";
	fields[2]="type";
	fields[3]="oppervlakte";
	var field="";
	var noinput=0;
	for(var i=0;i<fields.length;i++){
		field=fields[i];
		if(document.forms[0][field].selectedIndex==0)
			noinput++;
	}
	noinput=0;
	if(noinput>2)
		alert("Geef minimum 2 criteria in");
	else
		document.forms[0].submit();
}