function getSearchVariable(variable) 
    {
        var query = window.location.search.substring(1);
        var vars = query.split("&");
        for (var i=0;i<vars.length;i++) {
            var pair = vars[i].split("=");
            if(pair[0] == variable){
                return unescape(pair[1]).split("+").join(" ");
            }else{
                return ;
            }
        }
    }

    $(document).ready(function(){
        $("#search_box").val(getSearchVariable("search"));
    });