var overlay_start=0;
var wrapper_width;
var wrapper_height;

function enlarge(w,h,url){
	$('body').append(overlay_start="<div class='overlay_holder' onclick='disable()'></div>");
	$('body').append("<div class='overlay_wrapper'><div class='closebtt' onclick='disable()'></div><div id='overlay_content'><iframe id='myframe' src='' width='"+w+"' height='"+h+"' frameborder='0' scrolling='no'></frame></div></div>");
	wrapper_width=w;
	wrapper_height=h;
	
	$('.overlay_wrapper').css({
    position: 'fixed',
	padding:'10px',
    left: '50%',
    'margin-left': 0 - (wrapper_width / 2) -10,
	top: '50%',
	'margin-top': 0 - (wrapper_height / 2)-10
	});
	
	$('#overlay_content').css({
	width: wrapper_width,
	height: wrapper_height,
	position: 'relative'
	});
	
	insert_frame(url);
}

function insert_frame(myurl){
	$('#myframe').attr('src', myurl);
}

function disable(){
	if(overlay_start){
		$('.overlay_holder').remove();
		$('.overlay_wrapper').remove();
	}
}