function window_popup() {
	var url_page, x, y, window_width, window_height;
	if(arguments.length == 1) {
		url_page = arguments[0];
		window_width = window.screen.width * 0.5;
		window_height = window.screen.height * 0.5;
	} else if(arguments.length == 3) {
		url_page = arguments[0];
		window_width = arguments[1];
		window_height = arguments[2];		
	} else {
		//No arguments where passed, do nothing.
		return;
	}	
		
	pWin = window.open(url_page, null, 'height='+window_height+',width='+window_width+',toolbar=0,location=0,directories=0,menubar=0,status=No,scrollbars=1,resizable=0,channelmode=1,fullscreen=1');

}