<!--
// détection des navigateur netscape4.7 et opera
function Is()
{
var agt = navigator.userAgent.toLowerCase();
var major = parseInt(navigator.appVersion);
var nav  = ((agt.indexOf('mozilla')!=-1) && (agt.indexOf('spoofer')==-1) 
            && (agt.indexOf('compatible') == -1) && (agt.indexOf('opera')==-1) 
            && (agt.indexOf('webtv')==-1));
var nav4 = (nav && (major == 4));
var nav5 = (nav && (major == 5));			
var ie   = (agt.indexOf("msie") != -1);			
this.opera = (agt.indexOf("opera") != -1);		
this.nav47 = ((nav4) && (!nav5) && (!ie));
}
//-->