function isBlankField(textObj)
		{
			if(textObj.value =="")
				return true;
			else
				return false;

		}
		

		function validate(formObj) 
		{

			sErrText = '';

			if (isBlankField(formObj.fullName))
				sErrText +="\nName";


			if (isBlankField(formObj.address))
				sErrText +="\nE-mail Address";


			if(sErrText.length > 0)
			{
				alert("Sorry, Required data is missing: \n" + sErrText );
					return false;
			}


				
				else
					return true;

		}


function roll(img_name, img_src)
   {
   document[img_name].src = img_src;
   }