function matchHeight(){ 
     var divs,contDivs,maxHeight,divHeight,d; 
     // get all <div> elements in the document 
     divs=document.getElementsByTagName('div'); 
     contDivs=[]; 
     // initialize maximum height value 
     maxHeight=0; 
     // iterate over all <div> elements in the document 
     for(var i=0;i<divs.length;i++){ 
          // make collection with <div> elements with class attribute 'container' 
          if(/\bcontainer\b/.test(divs[i].className)){ 
                d=divs[i]; 
                contDivs[contDivs.length]=d; 
                // determine height for <div> element 
                if(d.offsetHeight){ 
                     divHeight=d.offsetHeight; 
                } 
                else if(d.style.pixelHeight){ 
                     divHeight=d.style.pixelHeight; 
                } 
                // calculate maximum height 
                maxHeight=Math.max(maxHeight,divHeight); 
          } 
     } 
     // assign maximum height value to all of container <div> elements 
     for(var i=0;i<contDivs.length;i++){ 
          contDivs[i].style.height=maxHeight+'px'; 
     } 
} 


    function chclass(what,onoff)
	{
		if (onoff==1) what.className='over';
		if (onoff==0) what.className='';
	}
    //-->
   
   

	function formCheck(formobj){
		//1) Enter name of mandatory fields
		var fieldRequired = Array("naam",
								  "email",
								  "reactie"
								  );
		//2) Enter field description to appear in the dialog box
		var fieldDescription = Array("Naam",
									 "E-mailadres",
									 "Uw reactie"
									 );
		//3) Enter dialog message
		var alertMsg = "Wilt u de volgende velden a.u.b. invullen:\n";
	
		var l_Msg = alertMsg.length;
	
		for (var i = 0; i < fieldRequired.length; i++){
			var obj = formobj.elements[fieldRequired[i]];
			if (obj){
				switch(obj.type){
				case "select-one":
					if (obj.selectedIndex == -1 || obj.options[obj.selectedIndex].text == ""){
						alertMsg += " - " + fieldDescription[i] + "\n";
					}
					break;
				case "select-multiple":
					if (obj.selectedIndex == -1){
						alertMsg += " - " + fieldDescription[i] + "\n";
					}
					break;
				case "text":
				case "textarea":
					if (obj.value == "" || obj.value == null){
						alertMsg += " - " + fieldDescription[i] + "\n";
					}
					break;
				default:
					if (obj.value == "" || obj.value == null){
						alertMsg += " - " + fieldDescription[i] + "\n";
					}
				}
			}
		}
	
		if (alertMsg.length == l_Msg){
			return true;
		}else{
			alert(alertMsg);
			return false;
		}
	}