W3Schools tutorial..web designing

				
				
				
				var txt="";
				function message()
				{
				try
				  {
				  adddlert("Welcome guest!");
				  }
				catch(err)
				  {
				  txt="There was an error on this page.\n\n";
				  txt+="Error description: " + err.description + "\n\n";
				  txt+="Click OK to continue.\n\n";
				  alert(txt);
				  }
				}