versOk = (((navigator.appName == "Netscape")&& (parseInt(navigator.appVersion) >= 3))||((navigator.appName == "Microsoft Internet Explorer")&&(parseInt(navigator.appVersion)>=4))); if(versOk){

b1_off = new Image(); b1_off.src="/interface/logo-tecso-off.gif";
b2_off = new Image(); b2_off.src="/interface/logo-prodiam-off.gif";
b3_off = new Image(); b3_off.src="/interface/logo-sertco-off.gif";

b1_on = new Image(); b1_on.src="/interface/logo-tecso-on.gif";
b2_on = new Image(); b2_on.src="/interface/logo-prodiam-on.gif";
b3_on = new Image(); b3_on.src="/interface/logo-sertco-on.gif";
} 
function rollOn(n){if (versOk){light=eval(n+"on.src");document [n].src=light;}} 
function rollOff(n){if (versOk){dark=eval(n+"off.src");document [n].src=dark;}}