var interfaceDesign = new Image(); 
var interfaceDesignOver = new Image();
var webDesign = new Image(); 
var webDesignOver = new Image();
var identity = new Image(); 
var identityOver = new Image();
var print = new Image(); 
var printOver = new Image();

interfaceDesign.src = "images/nav/interface_design.jpg";
interfaceDesignOver.src = "images/nav/interface_designOver.jpg";	
webDesign.src = "images/nav/web_design.jpg";
webDesignOver.src = "images/nav/web_designOver.jpg";	
identity.src = "images/nav/identity.jpg";
identityOver.src = "images/nav/identityOver.jpg";	
print.src = "images/nav/print.jpg";
printOver.src = "images/nav/printOver.jpg";