var Geometry = {};
if (typeof(window.screenLeft)=='number') { // IE and others
    Geometry.getWindowX = function( ) { return window.screenLeft; };
    Geometry.getWindowY = function( ) { return window.screenTop; };
}
else if (typeof(window.screenX)=='number') { // Firefox and others
    Geometry.getWindowX = function( ) { return window.screenX; };
    Geometry.getWindowY = function( ) { return window.screenY; };
}

if (typeof(window.innerWidth)=='number') { // All browsers but IE
    Geometry.getViewportWidth = function( ) { return window.innerWidth; };
    Geometry.getViewportHeight = function( ) { return window.innerHeight; };
    Geometry.getHorizontalScroll = function( ) { return window.pageXOffset; };
    Geometry.getVerticalScroll = function( ) { return window.pageYOffset; };
}
else if (document.documentElement 
	&& typeof(document.documentElement.clientWidth)=='number') {
//alert('document.documentElement.clientWidth:' + document.documentElement.clientWidth);
    // These functions are for IE 6 when there is a DOCTYPE
    Geometry.getViewportWidth =
        function( ) { return document.documentElement.clientWidth; };
    Geometry.getViewportHeight =
        function( ) { return document.documentElement.clientHeight; };
    Geometry.getHorizontalScroll =
        function( ) { return document.documentElement.scrollLeft; };
    Geometry.getVerticalScroll =
        function( ) { return document.documentElement.scrollTop; };
}
else if (typeof(document.body.clientWidth)=='number') {
//alert('document.body.clientWidth:' + document.body.clientWidth);
    // These are for IE4, IE5, and IE6 without a DOCTYPE
    Geometry.getViewportWidth =
        function( ) { return document.body.clientWidth; };
    Geometry.getViewportHeight =
        function( ) { return document.body.clientHeight; };
    Geometry.getHorizontalScroll =
        function( ) { return document.body.scrollLeft; };
    Geometry.getVerticalScroll =
        function( ) { return document.body.scrollTop; };
}

// These functions return the size of the document. They are not window
// related, but they are useful to have here anyway.

if (document.documentElement && typeof(document.documentElement.scrollWidth)=='number') {
    Geometry.getDocumentWidth =
        function( ) { return document.documentElement.scrollWidth; };
    Geometry.getDocumentHeight =
        function( ) { return document.documentElement.scrollHeight; };
}
else if (typeof(document.body.scrollWidth)=='number') {
    Geometry.getDocumentWidth =
        function( ) { return document.body.scrollWidth; };
    Geometry.getDocumentHeight =
        function( ) { return document.body.scrollHeight; };
}