function formCheck(formobj){
	// Enter name of mandatory fields
	var fieldRequired = Array("naam", "adres", "postcode", "plaats", "land", "telefoonnummer", "personen");
	// Enter field description to appear in the dialog box
	var fieldDescription = Array("Naam", "Adres", "Postcode", "Plaats", "Land", "Telefoonnummer", "Personen");
	// dialog message
	var alertMsg = "Vul a.u.b. de volgende verplichte velden in:\n\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.type == undefined){
				var blnchecked = false;
				for (var j = 0; j < obj.length; j++){
					if (obj[j].checked){
						blnchecked = true;
					}
				}
				if (!blnchecked){
					alertMsg += " - " + fieldDescription[i] + "\n";
				}
			}
		}
	}

	if (alertMsg.length == l_Msg){
		
	strAppVersion = navigator.appVersion;
	  if (document.form.file1.value != "" || document.form.file2.value != "" || document.form.file3.value != "" || document.form.file4.value != "" || document.form.file5.value != "" || document.form.file6.value != "" || document.form.file7.value != "" || document.form.file8.value != "" || document.form.file9.value != "" || document.form.file10.value != "" || document.form.file11.value != "" || document.form.file12.value != "")
	  {
		if (strAppVersion.indexOf('MSIE') != -1 && strAppVersion.substr(strAppVersion.indexOf('MSIE')+5,1) > 4)
		{
		  winstyle = "dialogWidth=385px; dialogHeight:140px; center:yes";
		  window.showModelessDialog('<% = barref %>&b=IE',null,winstyle);
		}
		else
		{
		  window.open('<% = barref %>&b=NN','','width=370,height=115', true);
		}
	  }
	  return true;
		
	}else{
		alert(alertMsg);
		return false;
	}
}