setHeaderImg();	

function mouseOverMenu(item) {
	document.getElementById(item).style.backgroundImage='url(\'img/menu/'+item+'_active.png\')';
	document.getElementById(item).style.zIndex = 2;
}

function mouseOutMenu(item) {
	document.getElementById(item).style.backgroundImage='url(\'img/menu/'+item+'.png\')';
	document.getElementById(item).style.zIndex = 1;

}

function setHeaderImg() {
	var page = location.search.substring(1);
	
	var rand_no;
	
	if(page == '' || page == 'page=samenstilling') {
		rand_no = 14;
	} else { 
		rand_no = Math.round(Math.random()*13+1);
	}
	document.getElementById("header_img").style.backgroundImage='url(\'img/header_img/'+rand_no+'.png\')';
}