$(document).ready(function() {
    var isExterior = location.href.indexOf("ExteriorSpecial.aspx") > 0;
    var imgNumber = isExterior ? 3 : Math.floor(Math.random() * 9) + 1;
    var backproperty = "url('images/level2_image" + imgNumber + ".jpg') no-repeat scroll 0 0 transparent";
    $("h2").css("background", backproperty);


});