how to use RadConfirm as simple confirm

JS CODE:

<script type="text/javascript">
    window.blockConfirm = function (text, mozEvent, oWidth, oHeight, callerObj, oTitle) {
        var ev = mozEvent ? mozEvent : window.event;
        ev.cancelBubble = true;
        ev.returnValue = false;
        if (ev.stopPropagation) ev.stopPropagation();
        if (ev.preventDefault) ev.preventDefault
        var callerObj = ev.srcElement ? ev.srcElement : ev.target;
        if (callerObj) {
            var callBackFn = function (arg) {
                if (arg) {
                    callerObj["onclick"] = "";
                    if (callerObj.tagName == "A") {
                        try {
                            eval(callerObj.href)
                        }
                        catch (e) { }
                    }
                    else if (callerObj.click) {
                        callerObj.click();
                    }
                }
            }
            radconfirm(text, callBackFn, oWidth, oHeight, callerObj, oTitle);
        }
        return false;
    }
</script>

HOW TO USE:

<asp:Button ID="btnDelete" OnClientClick="return blockConfirm('<br/>Are you sure you want to delete this record?<br/>&nbsp;', event, 340, 150, '', 'Delete confirm')" Text="Delete" runat="server" />