function hide_default() {


objsx = document.forms[2].xtra_1;

var n = objsx.selectedIndex;    // Which menu item is selected
var val = objsx[n].text;        // Return string value of menu item


	if ($val = 0) {
		 objE = document.getElementById('show_extra');
  		 objE.style.display = 'none';


	 }
	 else {

		 objEx = document.getElementById('show_extra');
  		 objEx.style.display = 'block';

	}

}


function show_extra() {
   
 if (document.forms[2].xtra_1.value != 0) {

		 objE = document.getElementById('show_extra');
  		 objE.style.display = 'block';


 }
 else {

		 objEx = document.getElementById('show_extra');
  		 objEx.style.display = 'none';



}

}