window.addEvent("domready", function() {
rss = new tabs('tips_nav', 'marketing');
 	 sign_email = new textbox('email', {msg : 'Email', css : 'sign', over : 'sign_over'});
 	 sign_name = new textbox('name', {msg : 'First Name', css : 'sign', over : 'sign_over'});
 	 
 	 var sign = $$('input.sign_submit'); 	 
 	 for (var i=0; i < sign.length; i++) { 	  
 	  sign[i].onmouseover=function() { 	    
      this.setStyle('background', 'url(images/tabs_bg_o.jpg)');      
    };
  	sign[i].onmouseout=function() {
  	  this.setStyle('background', 'url(images/submit_bg.jpg)');
  	};
 	 }
 	 
 	 var form = $('sub_form');
 	 form.onsubmit = function() {
 	  if ($('email').value.length == 0 || $('email').value == 'Email') {
 	   alert("Please provide a valid email address");
 	   return false;
 	  }
 	  
 	  var filter = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
 	  if (!filter.test($('email').value)) {
 	   alert("Please provide a valid email address");
 	   return false;
 	  }
 	  
 	  if ($('name').value.length == 0 || $('name').value == 'First Name') {
 	   alert("Please fill in your first name");
 	   return false;
 	  }
 	 }
});