function toggle(div_id) {
	var el = document.getElementById(div_id);
	if ( el.style.display == 'none' ){
		el.style.display = 'block';
	}
	else {
		el.style.display = 'none';
	}
}
function blanket_size(popUpDivVar) {
	if (typeof window.innerWidth != 'undefined') {
		viewportheight = window.innerHeight;
	}
	else {
		viewportheight = document.documentElement.clientHeight;
	}
	if ((viewportheight > document.body.parentNode.scrollHeight) && (viewportheight > document.body.parentNode.clientHeight)) {
		blanket_height = viewportheight;
	}
	else {
		if (document.body.parentNode.clientHeight > document.body.parentNode.scrollHeight) {
			blanket_height = document.body.parentNode.clientHeight;
		}
		else {
			blanket_height = document.body.parentNode.scrollHeight;
		}
	}
	if (typeof window.innerWidth != 'undefined') {
		viewportwidth = window.innerWidth;
	}
	else {
		viewportwidth = document.documentElement.clientWidth;
	}
	if ((viewportwidth > document.body.parentNode.scrollWidth) && (viewportwidth > document.body.parentNode.clientWidth)) {
		blanket_width = viewportwidth;
	}
	else {
		if (document.body.parentNode.clientWidth > document.body.parentNode.scrollWidth) {
			blanket_width = document.body.parentNode.clientWidth;
		}
		else {
			blanket_width = document.body.parentNode.scrollWidth;
		}
	}
	var blanket = document.getElementById('blanket');
	blanket.style.height = blanket_height + 'px';
	blanket.style.width = blanket_width + 'px';
	
	var popUpDiv = document.getElementById(popUpDivVar);
	popUpDiv.style.top = document.body.parentNode.scrollTop+(document.body.parentNode.clientHeight/10) + 'px';
}
function popup(windowname) {
	blanket_size(windowname);
	toggle('blanket');
	toggle(windowname);		
}