img1a=new Image;
img2a=new Image;
img3a=new Image;
img4a=new Image;
img5a=new Image;

img1a.src="images/portfolio_ov.gif";
img2a.src="images/exp_ov.gif";
img3a.src="images/contact_ov.gif";
img4a.src="images/p1_ov.gif";
img5a.src="images/p2_ov.gif";