function showPreview(strDiv, strHideMe) {
   self.document.getElementById(strDiv).style.display = 'inline';
   self.document.getElementById(strDiv).style.visibility = 'visible';
   self.document.getElementById(strHideMe).style.display = 'none';
   self.document.getElementById(strHideMe).style.visibility = 'hidden';
}

function hidePreview(strDiv, strShowMe) {
   self.document.getElementById(strDiv).style.display = 'none';
   self.document.getElementById(strDiv).style.visibility = 'hidden';
   self.document.getElementById(strShowMe).style.display = 'inline';
   self.document.getElementById(strShowMe).style.visibility = 'visible';
}

function check(formName){
		var naam = document.getElementById('txtNaam').value;
		var email = document.getElementById('txtEmail').value;
		var msg = "";
		var prefix_een  = "Het volgende veld dient nog ingevuld te worden: \r\n";
		var prefix_more = "De volgende velden dienen nog ingevuld te worden: \r\n";
		var count = 0;
		if(naam.length < 3 ){
			msg += "Naam";
			count++;
		}
		if(email.length < 5){
			if(email.indexOf("@")==-1 || email.indexOf(".")==-1){
				msg += "\r\nGeen geldig email-adres";
				count++
			}
			else {
				msg += "\r\nEmail-adres\r\n";
				count++ 
			}
		}
		if(count != 0){
			if(count == 1){
				alert(prefix_een + msg);
			}
			else {
				alert(prefix_more + msg);
			}
		}
		else {
			document.getElementById(formName).submit();
		}		
}

	function showhide(){
	
		 var mes = document.getElementById('mytype').value;

	    //if (mes=='huur' && document.getElementById('minh').className=="hidden") {
	    if (mes=='huur') {
	        document.getElementById('minh').className="show";
	        document.getElementById('mink').className="hidden";
	        document.getElementById('maxh').className="show";
	        document.getElementById('maxk').className="hidden";        
	    }
	    //else if (mes=='koop' && document.getElementById('mink').className=="hidden") {
	    else  {
	        document.getElementById('mink').className="show";
	        document.getElementById('minh').className="hidden";
	        document.getElementById('maxk').className="show";
	        document.getElementById('maxh').className="hidden";
	    }
	    //else {
	    //    document.getElementById('mink').className="show";
	    //    document.getElementById('minh').className="hidden";
	    //    document.getElementById('maxk').className="show";
	    //    document.getElementById('maxh').className="hidden";
	    //}
		return;	
	}

	function checkzoek(koop, huur){
		var minh 			= parseInt(document.getElementById('minh').value);
		var mink 			= parseInt(document.getElementById('mink').value);
		var maxh 			= parseInt(document.getElementById('maxh').value);
		var maxk 			= parseInt(document.getElementById('maxk').value);
		var soort 			= document.getElementById('mytype').value;
		var huur_step 		= parseInt(huur);
		var koop_step 		= parseInt(koop);
		//alert(soort);
		if(soort=='huur'){
			if(minh > maxh){
				maxh = minh + huur;
				document.getElementById('maxh').value = maxh;
				return true;
			}	
			else{
				return true;	
			}
		}
		if(soort=='huis' || soort=='bouw' || soort=='pand' || soort=='recr' || soort=='box' || soort=='rent'){
			if(mink > maxk){
				maxk = mink + koop;
				return true;
			}	
			else{
				return true;	
			}
		}
	}
	
	function changeSort(){
			sortNumber 	= document.getElementById("old_sortsel").value;
			document.getElementById("sortsel").value=sortNumber;
			document.formZoek.submit();	
	}