function showSignup(page){
       // if(page=="density_calculator.html"){ $("#divId").dialog( "option", "title", 'Density Calculator' ); }         
        $("#divRegister").dialog("open");
       $("#modalIframeId2").attr("src",page);
       return false;
    }
 
jQuery().ready(function($) {

         // login box
        $("#login_link").click(function(){
        if($("#login_box").css("display")=='none'){
            $("#login_box").slideDown();
			document.getElementById('shError').innerHTML='';
            if($("#login_box").attr("class")=="acc_bg"){ $("#login_button").attr('src','images/account_roll.jpg'); }
            else{ $("#login_button").attr('src','images/login_roll.jpg'); }           
            $("#login_box").mouseup(function() {
                    return false
                });

        }
        else{
            $("#login_box").hide();
           if($("#login_box").attr("class")=="acc_bg"){ $("#login_button").attr('src','images/account.jpg');}
           else{ $("#login_button").attr('src','images/login.jpg');} 
        }
        return false;
        });

        $(document).mouseup(function(e) {
            if($(e.target).parent("a#login_link").length==0) {
                $("#login_box").hide();
                if($("#login_box").attr("class")=="acc_bg"){ $("#login_button").attr('src','images/account.jpg');}
                else{ $("#login_button").attr('src','images/login.jpg');}
            }
        });   
        
         // find all the input elements with title attributes
                $('input[title!=""]').hint();
         
         $("#signin").hover(function(){ 
             $("#signin").toggleClass("ui-state-hover");
         });
         
         $("#signin").click(function(){
              $.get("search_email.php?q="+document.loginform.email.value, function(data){
                if(!data){
                     alert("This email address is not in our database!");
                     document.loginform.email.focus();
                }
                else{document.loginform.submit();} 
            });
         });
         
         //make an account popup
          $("#divRegister").dialog({
               autoOpen: false,
               modal: true,
               resizable: false,
               width: 710,
               height: "auto"          
       });                      

});