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;
			//popUpDiv_height = document.body.parentNode.clientHeight/2- 115/2;
		} else {
			blanket_height = document.body.parentNode.scrollHeight;
			//popUpDiv_height = document.body.parentNode.scrollHeight-document.body.parentNode.clientHeight/2 - 115/2; 
		}
	}
	
	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
	
	var iHeight = document.body.parentNode.scrollTop;
	if(iHeight== 0){
		// chrome
		iHeight = document.body.scrollTop;
	}
	
	popUpDiv_height = iHeight+115;		
	//alert(popUpDiv_height+":"+document.body.parentNode.scrollTop);
	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	
	//window_width = document.body.scrollLeft+screen.width/2-210;
	window_width = document.body.scrollLeft+document.body.parentNode.clientWidth/2-210;
	popUpDiv.style.left = window_width + 'px';	
}
function popup(windowname) {
	blanket_size(windowname);
	window_pos(windowname);
	toggle('blanket');
	toggle(windowname);		
}