var newwindow;
var intId;

function showPopup(url, width, height)
{
	
	if (!width > 0 ) width = 550;
	if (!height > 0 ) height = 370;
	
    var  screenX    = typeof window.screenX != 'undefined' ? window.screenX : window.screenLeft,
         screenY    = typeof window.screenY != 'undefined' ? window.screenY : window.screenTop,
         outerWidth = typeof window.outerWidth != 'undefined' ? window.outerWidth : document.body.clientWidth,
         outerHeight = typeof window.outerHeight != 'undefined' ? window.outerHeight : (document.body.clientHeight - 22),
         left     = parseInt(screenX + ((outerWidth - width) / 2), 10),
         top      = parseInt(screenY + ((outerHeight - height) / 2.5), 10),
         features = (
            'width=' + width +
            ',height=' + height +
            ',left=' + left +
            ',top=' + top
                  );
 
    newwindow=window.open(url,'show_popup_window', features);
 
    if (window.focus) {newwindow.focus()}
    return false;
    
}