$(document).ready(function(){

var width = document.body.clientWidth;
var height = document.body.clientHeight;
if ($.browser.msie && $.browser.version > 6) {
        var leftside = 750;
        var topsize = 343;
}

else if ($.browser.opera) {
    var leftside = 750;
    var topsize = 345;
}
else if ($.browser.mozilla) {
    var leftside = 750;
    var topsize = 345;
}
else {
    var leftside = 750;
    var topsize = 345;
}

    $("#baner").animate({
        width: "200px",
        height: "230px",
        left: leftside ,
        top: topsize
    },0);
    $("#close_btn").click(function(){
        $("#baner").remove();
    });
});