function MainMenuConvert( id ) {
	try {
		var elements = document.getElementById( id ).getElementsByTagName( 'a' );
		var tmp;
		var img;
		for( var i = 0; i < elements.length; i++ ) {
			tmp = elements[i];
			img = document.createElement( 'img' );
      img.src = ( tmp.className == 'link' ? '/securityacademy/images/menu_item.php?text=' + tmp.firstChild.nodeValue : '/securityacademy/images/menu_item.php?over&text=' + tmp.firstChild.nodeValue );
     	img.srcNormal = img.src;
			img.srcOver = '/securityacademy/images/menu_item.php?over&text=' + tmp.firstChild.nodeValue;

			img.onmouseover = function () { this.src = this.srcOver; }
			img.onmouseout = function () { this.src = this.srcNormal; }

			tmp.replaceChild( img, tmp.firstChild );
		}
	} catch ( e ) {
		alert ( 'Main menu not defined!' + e);
		throw( e );
	}
}