function smartRollover () {
	if ( document.getElementsByTagName ) {
		var	images	= document.getElementsByTagName ( "img" );

		for ( var i = 0; i < images.length; i ++ ) {
 			if ( images [ i ].getAttribute ( "src" ).match ( "Off" ) ) {
				images [ i ].onmouseover	= function () {
					this.setAttribute ( "src" , this.getAttribute ( "src" ).replace ( "Off" , "On" ) );
				}
				images [ i ].onmouseout	= function () {
					this.setAttribute ( "src" , this.getAttribute ( "src" ).replace ( "On" , "Off" ) );
				}
			}
		}
	}
}

if ( window.addEventListener ) {
	window.addEventListener ( "load" , smartRollover , false );
} else if ( window.attachEvent ) {
	window.attachEvent ( "onload" , smartRollover );
}