var Net=(navigator.appName.indexOf('Netscape') != -1)
var IE4=(!Net)&&(navigator.appVersion.indexOf('IE') !=-1)
var	MAC=(navigator.platform.indexOf('Mac') > -1)

var d=document

function appel_CSS(){
	u=(IE4)?'commun':'commun'
	d.write('<link rel="stylesheet" href="/html/'+u+'.css">')
}