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        if (document.images) {
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            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_serv.gif";
            img4off=new Image();   img4off.src="images/but_ind.gif";
            img5off=new Image();   img5off.src="images/but_gd.gif";
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            img7off=new Image();   img7off.src="images/but_contact.gif";
            
            img20off=new Image();   img20off.src="images/but_a_1.gif";
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            img44off=new Image();   img44off.src="images/but_s_5.gif";
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            img50off=new Image();   img50off.src="images/but_i_1.gif";
            img51off=new Image();   img51off.src="images/but_i_2.gif";
            img52off=new Image();   img52off.src="images/but_i_3.gif";
            img53off=new Image();   img53off.src="images/but_i_4.gif";
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    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-->