var detectionStr = navigator.userAgent.toLowerCase();      
var IE = ( detectionStr.indexOf( "msie" ) + 1 != 0 ) ? true : false;
var IE6 = ( detectionStr.indexOf( "msie 6.0" ) + 1 != 0 ) ? true : false;
var Konqueror = ( detectionStr.indexOf( "konqueror" ) + 1 != 0 ) ? true : false;
var Opera = ( detectionStr.indexOf( "opera" ) + 1 != 0 ) ? true : false;
var Safari = ( detectionStr.indexOf( "safari" ) + 1 != 0 ) ? true : false;