Cross-browser solution:

var supportPageOffset = window.pageXOffset !== undefined;

var isCSS1Compat = ((document.compatMode || ) === CSS1Compat);



var scrollLeft = supportPageOffset ? window.pageXOffset : isCSS1Compat ? document.documentElement.scrollLeft : document.body.scrollLeft;

var scrollTop = supportPageOffset ? window.pageYOffset : isCSS1Compat ? document.documentElement.scrollTop : document.body.scrollTop;

^source