<!-- hide from browsers that do not know JavaScript
        if (document.images) {
            img1on=new Image();   img1on.src="images/but_home1.gif";
            img2on=new Image();   img2on.src="images/but_about1.gif";
            img3on=new Image();   img3on.src="images/but_team1.gif";
            img4on=new Image();   img4on.src="images/but_contact1.gif";
            img5on=new Image();   img5on.src="images/but_virtual1.gif";
            img6on=new Image();   img6on.src="images/but_testi1.gif";
            img7on=new Image();   img7on.src="images/but_snore1.gif";
            img8on=new Image();   img8on.src="images/but_osa1.gif";
            img9on=new Image();   img9on.src="images/but_insomnia1.gif";
            img10on=new Image();   img10on.src="images/but_restleg1.gif";
            img11on=new Image();   img11on.src="images/but_help1.gif";
            img12on=new Image();   img12on.src="images/but_forms1.gif";
            
            img1off=new Image();   img1off.src="images/but_home.gif";
            img2off=new Image();   img2off.src="images/but_about.gif";
            img3off=new Image();   img3off.src="images/but_team.gif";
            img4off=new Image();   img4off.src="images/but_contact.gif";
            img5off=new Image();   img5off.src="images/but_virtual.gif";
            img6off=new Image();   img6off.src="images/but_testi.gif";
            img7off=new Image();   img7off.src="images/but_snore.gif";
            img8off=new Image();   img8off.src="images/but_osa.gif";
            img9off=new Image();   img9off.src="images/but_insomnia.gif";
            img10off=new Image();   img10off.src="images/but_restleg.gif";
            img11off=new Image();   img11off.src="images/but_help.gif";
            img12off=new Image();   img12off.src="images/but_forms.gif";
        }


    function imgOn(imgName,txt) {
            if (document.images) {
                document[imgName].src = eval(imgName + "on.src");
            }
    }
    function imgOff(imgName) {
            if (document.images) {
                document[imgName].src = eval(imgName + "off.src");
            }
    }

function popwin(img,w,h){
var x1 = screen.width;
var y1 = screen.height;
var top = parseInt((y1 - h)/2);
var left = parseInt((x1 - w)/2);
window.open(img,'show','width='+w+',height='+h+',resizable=no,scrollbars=no,status=no,top='+top+',left='+left);
return false;
}
// end hiding-->