jQuery.fn.imgRollOver = function() {
	this.each(function(){
		if( !$j(this).attr("src") )
			return false;
		
		if( $j(this).attr("src").indexOf("_on") != -1 ) // No rollover on images already in state "on"
			return;
		
		$j(this).hover(function(){
			imgOff = $j(this).attr("src");
			$j(this).attr("src",imgOff.replace("_off","_on"));
		},function(){
            imgSrc=$j(this).attr("src");
			$j(this).attr("src",imgOff.replace("_on","_off"));
		});
	});
}