if (document.images) {

home = new Image(55,24);
home.src= "/images/nav/btnhome.gif";
homeOn = new Image(55,24);
homeOn.src = "/images/nav/btnhome_on.gif";

framework = new Image(125,32);
framework.src = "/images/nav/btnframework.gif";
frameworkOn = new Image(125,32);
frameworkOn.src = "/images/nav/btnframework_on.gif";

news = new Image(125,32);
news.src = "/images/nav/btnnews.gif";
newsOn = new Image(125,32);
newsOn.src = "/images/nav/btnnews_on.gif";

contacts = new Image(125,32);
contacts.src = "/images/nav/btncontacts.gif";
contactsOn = new Image(125,32);
contactsOn.src = "/images/nav/btncontacts_on.gif";

aboutus = new Image(125,32);
aboutus.src = "/images/nav/btnaboutus.gif";
aboutusOn = new Image(125,32);
aboutusOn.src = "/images/nav/btnaboutus_on.gif";

}

function on(pic)
{
if (document.images) 
 {
 document.images['home'].src = home.src;
 document.images['framework'].src = framework.src;
 document.images['news'].src = news.src;
 document.images['contacts'].src = contacts.src;
 document.images['aboutus'].src = aboutus.src;
 
 if ( pic != "" )
 	{
 	document.images[pic].src = eval( pic + "On.src");
 	}
 }
}