$(document).ready(function() {
    var random_num = (Math.round((Math.random()*3)+1)) 
    var imgUrl;
           
    switch(random_num)
    {
        case 1: imgUrl = '<a href="call-form.htm"><img src="images/promoBox_susan.gif" /></a>';
        break;
        case 2: imgUrl = '<a href="call-form.htm"><img src="images/promoBox_firstservice.gif" /></a>';
        break;
        case 3: imgUrl = '<a href="call-form.htm"><img src="images/promoBox_fixture.gif" /></a>';
        break;
        case 4: imgUrl = '<a href="call-form.htm"><img src="images/promoBox_waterheater.gif" /></a>';
        break;
        default: imgUrl = "dsf";
    }
    
    $("#promoBox").html(imgUrl);
            
    $("#tbMailList").focus(function() {
        $(this).val("");
        $(this).removeClass("tbMailList").addClass("tbMailList_focus");  
    });
                    
    $("#tbMailList").blur(function() {
        if($(this).val()==""){
            $(this).removeClass("tbMailList_focus").addClass("tbMailList");  
            $(this).val("email address")
        }
    });
    $("#mailListform").validate({
        messages: {
	        tbMailList: {
		        required: ' !',
		        email: ' !'
		    }
	    }		
    });
});