if (document.images) {
	portfolio_off= new Image(90,25);
	portfolio_off.src='img/nav_home-portfolio_off.gif';
	portfolio_hover= new Image(90,25);
	portfolio_hover.src='img/nav_home-portfolio_hover.gif';
	
	about_off= new Image(98,25);
	about_off.src='img/nav_home-about_off.gif';
	about_hover= new Image(98,25);
	about_hover.src='img/nav_home-about_hover.gif';
	
	contact_off= new Image(99,25);
	contact_off.src='img/nav_home-contact_off.gif';
	contact_hover= new Image(99,25);
	contact_hover.src='img/nav_home-contact_hover.gif';
}