Code JavaScript:
                function backspace_delete(e, delete_ele_id) 
		{
			if (!e) 
			{ 
				// IE reports window.event instead of the argument
				e = window.event;
			}
			var keycode;
 
			if (document.all) 
			{
				// IE
				keycode = e.keyCode;
			} 
			else 
			{
				// Not IE
				keycode = e.which;
			}
 
			if (keycode == 8 && with_field.value == '')
			 {
				if (document.all)
				{
					//IE
					removeElementById(delete_ele_id);
				} 
				else 
				{
					//Non IE
					removeElementById(delete_ele_id);
				}
			}
		}