function adapt_content_height(not_content_height, content_min_height) {
	/*
		change content height
		not_content_height is the sum of banner, footer, paddings and margins heights
	*/

	var content_height = document.getElementById("content").offsetHeight;

	if (content_height < content_min_height) {	

		if (typeof(window.innerHeight) == "number") {
			window_height = window.innerHeight;
		}
		else {
			if (document.documentElement && document.documentElement.clientHeight) {
				window_height = document.documentElement.clientHeight;
			}
			else {
				if (document.body && document.body.clientHeight) {
					window_height = document.body.clientHeight;
				}
			}
		}
		document.getElementById("content").style.height = (window_height - not_content_height) + "px";
	}	
}

function open_popup(page,page_width,page_height,options) {
 
  var top=(screen.height-page_width)/2;
  var left=(screen.width-page_height)/2;
  window.open(page,"","top="+top+",left="+left+",width="+page_width+",height="+page_height+",menubar=no,scrollbars=no,statusbar=no,location=no");
}