function checkUncheckAll(theElement) {
	var theForm = theElement.form, z = 0;
	for(z=0; z<theForm.length;z++){
		if(theForm[z].type == 'checkbox' && theForm[z].name != 'checkall'){
			theForm[z].checked = theElement.checked;
		}
	}
}

function update_dates(selection) {
	var frm = document.getElementById("kies");
	frm.begindatum.value = selection;
	if(selection == "Kies..."){
		frm.begindatum.value="";
		frm.einddatum.value="";
	}
	else {
		frm.begindatum.value= "01-01-" + selection;
		frm.einddatum.value= "31-12-" + selection;
	}
}
function ShowHide(id, visibility) {
    obj = document.getElementsByTagName("img");
    obj[id].style.visibility = visibility;
}

// these functions also remove the space that the object uses
function show(the_object){
	div = document.getElementById(the_object);
	div.style.display = '';
}
function hide(the_object){
	div = document.getElementById(the_object);
	div.style.display = 'none';
}


function checkAantal(){
//
}

function studentWindow(get){
	var LeftPosition = (screen.width) ? (screen.width-665)/2 : 0;
	var TopPosition = (screen.height) ? (screen.height-430)/2 : 0;
	var Optie='';
	if (document.forms['reactie'].elements['sponsorids'].value!=''){
		var Optie="&get="+document.forms['reactie'].elements['sponsorids'].value;
	}
	else if (get!=''){
		var Optie="&get="+get;
	}
	newWindow = window.open("test.php?item=kiesstudent&grp2=internationaal"+Optie,"Studenten","location=no,toolbar=no,status=no,directories=no,scrollbars=yes,resizable=no,menubar=no,width=700,height=600,top="+TopPosition+",left="+LeftPosition);
	newWindow.opener = self;
	newWindow.focus();
}

function ValidateForm(){
	return true;	
}