function openimagediv(pageHeight) {
	pageHeight = document.getElementById("maincontainer").offsetHeight;
	document.getElementById('overlaydiv').style.width = '100%';
	document.getElementById('overlaydiv').style.height = pageHeight+'px';
	
	document.getElementById('overlaydivsrc').style.margin = '60px 0 0 0';
	
	document.getElementById('overlaydiv').style.display = 'block';
	document.getElementById('overlaydivcontent').style.display = 'block';
}

function closeimagediv() {
	document.getElementById('overlaydivcontent').style.display = 'none';
	document.getElementById('overlaydiv').style.display = 'none';
}