function OpenCentreWindows(source)
{
var h=600; // height of window
var w=650; // width of window
var leftPos=(screen.width/2)-(w/2); // left position of window
var topPos=(screen.height/2)-(h/2); // top position of window
var pos='left='+leftPos+',top='+topPos;
var s='yes';
var r='yes';
var m='yes';
props=pos+',width='+w+',height='+h+',scrollbars='+s+',resizable='+r;
window.open(source,'new',props);
}