//clear text fields
			function clearfield(obj)
			{
				if (obj.value == "Email") 
					obj.value = "";
				else if(obj.value == "Search")
					obj.value = "";
			}
			
			function CheckForm(el,id) 
			{
				if(el.id == "btnSignUp")
					el = document.getElementById("txtSignUp");

				if(el.id == "txtSignUp")
				{
					var re = /^.+@.+\..{2,3}$/i;
					if(re.test(el.value))
					{
						return __doPostBack(id.toString(),'');
					}
					else
					{
						alert("Please enter a valid email address.");
						//set the focus will wipe out what was there, so preserve it first
						var tmp = el.value;
						el.focus();
						el.value = tmp;
						return false;
					}
				}
				else if(el.id == "search")
				{
					if(el.value == "Search" || el.value == "")
					{
						alert("Please enter at least one keyword to search.");
						return false;
					}
					else
					{
						__doPostBack(id.toString(),'');
						//set the focus will wipe out what was there, so preserve it first
						var tmp = el.value;
						el.focus();
						el.value = tmp;
						return false;
					}
				}
				else
					return false;
			}