var ua = 0;

if(navigator.userAgent.indexOf("Opera") >= 0){ua = 2;}

else if( (navigator.userAgent.indexOf("MSIE 7.") >= 0)
&&(navigator.userAgent.indexOf("Windows") >= 0) ){ua = 1;}

else if( (navigator.userAgent.indexOf("MSIE 6.") >= 0)
&&(navigator.userAgent.indexOf("Windows") >= 0) ){ua = 1;}

else if( (navigator.userAgent.indexOf("MSIE 5.") >= 0)
&&(navigator.userAgent.indexOf("Windows") >= 0) ){ua = 1;}

else if( (navigator.userAgent.indexOf("Mozilla/7.") >= 0)
&&(navigator.userAgent.indexOf("Windows") >= 0) ){ua = 1;}

else if( (navigator.userAgent.indexOf("Mozilla/6.") >= 0)
&&(navigator.userAgent.indexOf("Windows") >= 0) ){ua = 1;}

else if( (navigator.userAgent.indexOf("Mozilla/5.") >= 0)
&&(navigator.userAgent.indexOf("Windows") >= 0) ){ua = 1;}

else {ua = 2;}