// detection du navigateur
		function getCss()
		{
			agent = navigator.userAgent.toLowerCase();
			
			var ie = kon = safari = ns = gecko = win = mac = opera = 0;
			var lin = 1 ;
			var css = "";
	
			if (  agent.indexOf('msie') != -1){ ie = 1;}
			if (  agent.indexOf('gecko') != -1){ gecko = 1;}
			if (  agent.indexOf('netscape') != -1){ ns = 1;}
			if (  agent.indexOf('konqueror') != -1){ kon = 1;}
			if (  agent.indexOf('safari') != -1){ safari = 1;}
			if (  agent.indexOf('opera') != -1){ opera = 1;}
	
			// detection de l'OS
			if ( agent.indexOf('win') != -1 ) { win = 1;lin=0;}
			if ( agent.indexOf('mac') != -1 ) { mac = 1;lin=0;}
	
			// choix de la css
			if ( win && ie ) { css='IE' ;}
			if ( win && gecko ) { css='NS' ;}
			if ( win && opera ) { css='OP' ;}
			if ( mac && kon ) { css='KON' ;}
			if ( mac && safari ) { css='SAF' ;}
			if ( mac && ie ) { css='MAC' ;}
			return css;
		}