ÿþfunction 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;
		}
	}
}

window.onscroll = document.documentElement.onscroll = movemenu;
window.onresize = document.documentElement.onscroll = movemenu;

function movemenu(){
	if( window.XMLHttpRequest ) { // IE 6 doesn't implement position fixed nicely...
		if(document.getElementById('positie')){
			if (document.documentElement.scrollTop > 107 || self.pageYOffset > 107) {
				document.getElementById('positie').style.position = 'fixed'; 
				document.getElementById('positie').style.top = '0';
			} else if (document.documentElement.scrollTop < 107 || self.pageYOffset < 107) {
				document.getElementById('positie').style.position = 'absolute'; 
				document.getElementById('positie').style.top = 'auto';
			}
		}
	}
}


function isNumeric(elem, helperMsg){
	var numericExpression = /^[0-9]+$/;
	if(elem.value.match(numericExpression)){
		return true;
	}else{
		alert(helperMsg);
		elem.focus();
		elem.value='';
		return false;
	}
}

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';
}