ImageButtons not working in IE10

<script language="javascript" type="text/javascript">
function x()
{

if (typeof (Sys) !== 'undefined' && Sys.Browser.agent === Sys.Browser.InternetExplorer && Sys.Browser.version === 10) {
         Sys.WebForms.PageRequestManager.getInstance()._onFormElementActive = function Sys$WebForms$PageRequestManager$_onFormElementActive(element, offsetX, offsetY) {
             if (element.disabled) { return; }
             this._activeElement = element;
             this._postBackSettings = this._getPostBackSettings(element, element.name);
             if (element.name) {
                 var tagName = element.tagName.toUpperCase();
                 if (tagName === 'INPUT') {
                     var type = element.type;
                     if (type === 'submit') {
                         this._additionalInput = encodeURIComponent(element.name) + '=' + encodeURIComponent(element.value);
                     }
                     else if (type === 'image') {
                         this._additionalInput = encodeURIComponent(element.name) + '.x=' + Math.floor(offsetX) + '&' + encodeURIComponent(element.name) + '.y=' + Math.floor(offsetY);
                     }
                 }
                 else if ((tagName === 'BUTTON') && (element.name.length !== 0) && (element.type === 'submit')) {
                     this._additionalInput = encodeURIComponent(element.name) + '=' + encodeURIComponent(element.value);
                 }
             }
         };
     }
}
</script>