function toggle(div_id) {
	var el = document.getElementById(div_id);
	
	if (div_id != "blanket" ) {
		var ctname = "ct" + div_id;
		var cbname = "cb" + div_id;
		
		/*alert(ctname);
		alert(cbname);
		*/
		window_pos(ctname);
		window_pos(cbname);
		
		
		var ct = document.getElementById(ctname);
		var cb = document.getElementById(cbname);
	}
	
	if ( el.style.display == 'none' ) {	
	
		if (ct) ct.style.display = 'block';
		if (cb) cb.style.display = 'block';
		
		el.style.display = 'block';
	}
	else {
		el.style.display = 'none';
		if (ct) ct.style.display = 'none';
		if (cb) cb.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=blanket_height/2-150;//150 is half popup's height
	popUpDiv.style.top = popUpDiv_height + 'px';
}
function window_pos(popUpDivVar) {
	if (typeof window.innerWidth != 'undefined') {
		viewportwidth = window.innerHeight;
	} 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/2-150;//150 is half popup's width
	popUpDiv.style.left = window_width + 'px';
}
function popup(windowname) {
	blanket_size(windowname);
	window_pos(windowname); 
	toggle('blanket');
	toggle(windowname);		
}