home1=new Image(164,36); home1.src='images/home.gif';
home2=new Image(164,36); home2.src='images/home_o.gif';
about1=new Image(164,36); about1.src='images/about.gif';
about2=new Image(164,36); about2.src='images/about_o.gif';
cases1=new Image(164,36); cases1.src='images/notable.gif';
cases2=new Image(164,36); cases2.src='images/notable_o.gif';


function changepic (imgTagName, imgObj) {
if (document.images) {
   document.images[imgTagName].src=imgObj.src}
}