/**
 * File: popup.js
 * Author: Brian Borowski
 * Date created: December 28, 2001
 * Date last modified: July 10, 2010
 */
var win;

function launchCenter(url, name, popupHeight, popupWidth) {
    var leftPos = 0, topPos = 0, width, height;

    if (self.innerHeight) {
        // All except Explorer
        width = self.innerWidth;
        height = self.innerHeight;
    } else if (document.documentElement && document.documentElement.clientHeight) {
        // Explorer 6 Strict Mode
        width = document.documentElement.clientWidth;
        height = document.documentElement.clientHeight;
    } else if (document.body) {
        // Other Explorers
        width = document.body.clientWidth;
        height = document.body.clientHeight;
    }
    topPos = (height - popupHeight) / 2;
    leftPos = (width - popupWidth) / 2;

    if (window.screenY) {
        topPos += window.top.screenY;
        leftPos += window.top.screenX;
    } else if (window.screenTop) {
        topPos += window.top.screenTop / 2;
        leftPos += window.top.screenLeft;
    }
    if (topPos < 0) {
        topPos = 0;
    }
    if (topPos + popupHeight > screen.availHeight) {
        topPos = screen.availHeight - popupHeight;
    }
    if (leftPos < 0) {
        leftPos = 0;
    }
    if (leftPos + popupWidth > screen.availWidth) {
        leftPos = screen.availWidth - popupWidth;
    }
    if (win == null || win.closed) {
        win = window.open(url, name,
            'screenX=' + leftPos +
            ',screenY=' + topPos +
            ',screenLeft=' + leftPos +
            ',screenTop=' + topPos +
            ',left=' + leftPos +
            ',top=' + topPos +
            ',width=' + popupWidth +
            ',height=' + popupHeight +
            ',location=no,toolbar=no,menubar=no,status=no' +
            ',directories=no,scrollbars=yes,resizable=yes');
    } else {
        win.location = url;
    }
    win.focus();
}