if (top.location != self.location) {
  top.location.replace(self.location);
}

ab1=new Image;ab1.src='images/about.gif';
se1=new Image;se1.src='images/services.gif';
po1=new Image;po1.src='images/portfolio.gif';
co1=new Image;co1.src='images/contact.gif';
pa1=new Image;pa1.src='images/partners.gif';
li1=new Image;li1.src='images/links.gif';
ho1=new Image;ho1.src='images/home.gif';

ab2=new Image;ab2.src='images/aboutover.gif';
se2=new Image;se2.src='images/servicesover.gif';
po2=new Image;po2.src='images/portfolioover.gif';
co2=new Image;co2.src='images/contactover.gif';
pa2=new Image;pa2.src='images/partnersover.gif';
li2=new Image;li2.src='images/linksover.gif';
ho2=new Image;ho2.src='images/homeover.gif';