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=blanket_height/2-219;
	// 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/2-219;
	popUpDiv.style.bottom = 240 + 'px';
	popUpDiv.style.left = window_width + 'px';
}

function popup(windowname){
	// blanket_size(windowname);
	window_pos(windowname);
	// toggle('blanket');
	toggle(windowname);		
}