bData = null;

function browserData(browser,version,platform) {
   this.browser = browser;
   this.version = version;
   this.platform = platform;
}

function browserInfo() {
        if (bData == null) bData = new browserData(0,null,0);

        // BROWSER TYPE

        if ((navigator.appName.indexOf("Netscape") >= 0)||
                (navigator.appName.indexOf("Navigator") >= 0)){
                bData.browser=1;
        }else
        if (navigator.appName.indexOf("Explorer") >= 0){
                bData.browser=2;
        }else
                bData.browser=0;


        // BROWSER VERSION

        var tail = navigator.appVersion.indexOf(' ');
        bData.version = parseFloat(navigator.appVersion.substring(0,tail));
        var head =  navigator.appVersion.indexOf('(');
        var tail =  navigator.appVersion.indexOf(')');

        // BROWSER PLATFORM

        brPlatformData =navigator.appVersion.substring(head,tail);
        if (brPlatformData.indexOf("Macintosh") >= 0){
                if ( brPlatformData.indexOf("PPC") >= 0){
                        bData.platform=2;
                }else
                        bData.platform=1;
        }else{
                if ( brPlatformData.indexOf("Win") >= 0) bData.platform=3;
        }
}

function rollIn(imgName) {
        if ((bData.browser == 1) && (bData.version >=3) || (bData.browser==2 && bData.version>=4)) {
        imgFile = imgName + "_on.gif";
        document [imgName].src = imgFile;
        }
}


function rollOut(imgName) {
        if ((bData.browser == 1) && (bData.version >=3) || (bData.browser==2 && bData.version>=4)) {
        imgFile = imgName + "_off.gif";
        document [imgName].src = imgFile;
        }
}


function finestra(url,windowName,w,h){
	externimg=window.open(url, windowName,'toolbar=no,location=no,directories=no,status=no,menubar=yes,scrollbars=yes,resizable=yes,copyhistory=no,width='+w+',height='+h);
	externimg.focus();
	}
	
browserInfo();

function preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.p) d.p=new Array();
    var i,j=d.p.length,a=preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.p[j]=new Image; d.p[j++].src=a[i];}}
}