var popWidth = 750;
var popHeight = 550;

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;
		}
	}
	
	var blanket = document.getElementById('blanket');
	blanket.style.height = blanket_height + 'px';
	var popUpDiv = document.getElementById(popUpDivVar);
	popUpDiv_height = viewportheight / 2 - (popHeight / 2);
	popUpDiv.style.top = popUpDiv_height + 'px';
}

function window_pos(popUpDivVar) 
{
	if (typeof window.innerWidth != 'undefined') {
		viewportwidth = window.innerWidth;
	} else {
		viewportwidth = document.documentElement.clientHeight;
	}
	
	if ((viewportwidth > document.body.parentNode.scrollWidth) && (viewportwidth > document.body.parentNode.clientWidth)) {
		window_width = viewportwidth;
	} else {
		if (document.body.parentNode.clientWidth > document.body.parentNode.scrollWidth) {
			window_width = document.body.parentNode.clientWidth;
		} else {
			window_width = document.body.parentNode.scrollWidth;
		}
	}
	
	var popUpDiv = document.getElementById(popUpDivVar);
	window_width = window_width / 2 - (popWidth / 2);
	popUpDiv.style.left = window_width + 'px';
}

function popup_open(windowname, userid, username) 
{
	blanket_size(windowname);
	window_pos(windowname);
	toggle('blanket');
	toggle(windowname);
	document.getElementById("USERID").value = userid;
	document.getElementById("TO").value = username;
}

function popup_close(windowname) 
{
	toggle('blanket');
	toggle(windowname);
}