function popIt(url,name,newWidth,newHeight){
var newTop = 0, newLeft = 0;
if (window.outerHeight) {
    newTop = window.screenY + ((window.outerHeight - newHeight) / 2 + 10);} else
{
    newTop = window.screenTop + ((document.body.offsetHeight - newHeight - 35)/2);
}
if (window.outerWidth) {
    newLeft = window.screenX + ((window.outerWidth - newWidth) / 2 - 10);} else {
    newLeft = window.screenLeft + ((document.body.offsetWidth - newWidth - 10)/2);
}
window.open(url,name, 'screenX=' + newLeft +
    ',screenY=' + newTop +
    ',left=' + newLeft +
    ',top=' + newTop +
    ',width=' + newWidth +
    ',height=' + newHeight);

}