function callme()
{
url = "http://www.cleanroomshop.co.uk/callme.htm";
var window_width = 380;
var window_height = 300;
var sw = screen.width;
var sh = screen.height;
var window_left = ((sw/2) - (window_width/2) - 16);
var window_top = ((sh/2) - (window_height/2) - 20);
friendwin = open(url,"callme","width="+ window_width +",height="+ window_height +",scrollbars=no,toolbar=no,directories=no,menubar=no,resizable=yes,status=no,left="+ window_left +",top="+ window_top +",screenx="+ window_left +",screeny="+ window_top);

}