/**/
	var _agent = navigator.userAgent.toLowerCase();

/* platform */
	var _win = (_agent.indexOf("win") != -1) ;
	var _mac = (_agent.indexOf("mac") != -1) ;
	
/* browser version */
	var _major = parseInt(navigator.appVersion) ;
	var _minor = parseFloat(navigator.appVersion) ;
	
/* netscape */
	var _nn    = ((_agent.indexOf("mozilla") != -1 ) && (_agent.indexOf("compatible") == -1 )) ;
	var _nn2   = (_nn && (_major == 2 )) ;
	var _nn3   = (_nn && (_major == 3 )) ;
	var _nav   = (_nn && ((_agent.indexOf(";nav") != -1 ) || (_agent.indexOf("; nav") != -1 ))) ;
	var _nav3  = (_nn && _nav && (_major == 3 )) ;
	var _nav4  = (_nn && _nav && (_major == 4 )) ;
	var _nn4   = (_nn && (_major == 4 )) ;
	var _nn4up = (_nn && (_major >= 4 )) ;
	var _nn6   = (_nn && (_major == 5 )) ;
	var _nn6up = (_nn && (_major >= 5 )) ;
	var _nn61  = (_nn6 && (_agent.indexOf("netscape6") != -1 )) ;
	var _nn7   = (_nn6 && (_agent.indexOf("netscape/7") != -1 )) ;
	
	
/* internet explorer */
	var _ie = (_agent.indexOf("msie") != -1) ;
	var _ie3 = (_ie && (_major < 4 )) ;
	var _ie4 = (_ie && (_major == 4 ) && (_agent.indexOf("msie 5") == -1)) ;
	var _ie4up = (_ie && (_major >= 4 )) ;
	var _ie45 = (_ie && (_minor == 4.5 )) ;
	var _ie5 = (_ie && (_major == 4 ) && (_agent.indexOf("msie 5") != -1)) ;
	var _ie5up = (_ie && !_ie3 && !_ie4 ) ;
	var _ie6 = (_ie && (_major == 4) && (_agent.indexOf("msie 6") != -1)) ;
	
/* opera */
	var _opera = (_agent.indexOf("opera") != -1) ;
	var _opera5 = (_opera && (_major == 5 )) ;
	var _opera6 = (_opera && (_major == 6 )) ;
	var _opera7 = (_opera && (_major == 7 )) ;
	
/* icab */
	var _icab = (_agent.indexOf("icab") != -1) ;