// ******************************************************************************
// **
// **	    open_pop_up
// **	 	opends a popup window with the given uri
// **		if the popup is alredy open it will be reloaded
// **
// ******************************************************************************

var popups = new Array();
function open_pop_up(popup_id,popup_uri){
	
	if(popups[popup_id]){
		if(!popups[popup_id].closed){
			popups[popup_id].location.href = popup_uri;
			popups[popup_id].focus();
			return;
		}
	}
	
	var options = 'scrollbars=yes,toolbar=no,status=no,resizable=no,menubar=no,location=no,directories=no';
	var height = 500;
	var width = 750;
	var top = (screen.height-height)/2;
	var left= (screen.width-width)/2;
	
	popups[popup_id] = window.open(popup_uri,popup_id,"top="+top+",left="+left+",width="+width+",height="+height+","+options);
	popups[popup_id].focus();
	return;
}