var a = document.createElement("a");
var img = document.createElement("IMG");

function toggle(div_id) {
	var el = document.getElementById(div_id);
	if ( el.style.display == 'none' ) {	
		el.style.display = 'block'; 
	} else { 
		el.style.display = 'none';
		document.getElementById('popUpDiv').removeChild(a);
	}
}
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/2-225;
	popUpDiv.style.top = popUpDiv_height + 'px';
}
function window_pos(popUpDivVar) {
	
	if (typeof window.innerWidth != 'undefined') {
		viewportwidth = window.innerWidth;
	} else {
		viewportwidth = document.documentElement.clientWidth;
	}
	
	
	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;
		}
	}
	
	
	if (typeof window.innerHeight != 'undefined') {
		viewportheight = window.innerHeight;
	} else {
		viewportheight = document.documentElement.clientHeight;
	}
	
	var popUpDiv = document.getElementById(popUpDivVar);
	window_width=window_width/2-150;
	window_height=viewportheight/2-225;
	popUpDiv.style.left = window_width + 'px';
	popUpDiv.style.top = window_height + 'px';

}

function choose_bg(popUpDivVar, bannerNum){
	if(bannerNum == "0"){
		a.href = "http://www.bellyelan.com/"
		img.src = "images/bellyelan_banner_lg.jpg";
	} else if(bannerNum == "1"){
		a.href = "http://www.theprenatalpicture.com/"
		img.src = "images/prenatalpicture_banner_lg.jpg";
	} else if(bannerNum == "2"){
		a.href = "http://www.usababycharlotte.com/"
		img.src = "images/usababy_banner_lg.jpg";
	}
	a.appendChild(img);
	document.getElementById('popUpDiv').appendChild(a);
}

function clickBanner(){
	window.open("http://www.bellyelan.com/", null, null, null);	
}

function popup(windowname, number) {
	blanket_size(windowname);
	window_pos(windowname);
	toggle('blanket');
	toggle(windowname);	
	choose_bg(windowname, number);
}