//scroll examples function select="example"
function change_iframe(my_select){
	var selectedurl=my_select.options[my_select.selectedIndex].value;
	if (document.getElementById)
		document.getElementById("external").src=selectedurl;
	else if (document.all)
			document.all.external.src=selectedurl;
		 else{
			if (!window.win2||win2.closed)
				win2=window.open(selectedurl);
			//else if win2 already exists
			else{
				win2.location=selectedurl;
				win2.focus()
			}
		}
}