$(document).ready(function(){
	
	/* ===== Smooth scroll =====*/
	$('#go_top').bind('click', function(){
		$('html,body').stop().animate({scrollTop: 0}, {duration:1000,queue:false});
		return false;
	});
	/* ===== END Smooth scroll =====*/
	
	$(window).scroll(function(){
		
		if (whichBrs()=='chrome' || whichBrs()=='Safari')
		{
			scroll_final=document.body.scrollTop;   /// identify  scroll position in pixels for chorme
		}
		if (whichBrs()=='Internet Explorer' || whichBrs()=='Firefox' || whichBrs()=='Opera' )
		{
			scroll_final=document.documentElement.scrollTop; // identify scroll position for IE and firefox
		}

		if (scroll_final < 150){
			$("#go_top").hide().stop().animate({opacity: 0},{duration:500,queue:false});
		}
		
		if (scroll_final >= 150) {
			$("#go_top").show().stop().animate({opacity: 1},{duration:200,queue:false});
		} 
	});
});


function whichBrs() {
	var agt=navigator.userAgent.toLowerCase();
	if (agt.indexOf("opera") != -1) return 'Opera';
	if (agt.indexOf("staroffice") != -1) return 'Star Office';
	if (agt.indexOf("webtv") != -1) return 'WebTV';
	if (agt.indexOf("beonex") != -1) return 'Beonex';
	if (agt.indexOf("chimera") != -1) return 'Chimera';
	if (agt.indexOf("netpositive") != -1) return 'NetPositive';
	if (agt.indexOf("phoenix") != -1) return 'Phoenix';
	if (agt.indexOf("firefox") != -1) return 'Firefox';
	if (agt.indexOf("chrome") != -1) return 'chrome';
	if (agt.indexOf("safari") != -1) return 'Safari';
	if (agt.indexOf("skipstone") != -1) return 'SkipStone';
	if (agt.indexOf("msie") != -1) return 'Internet Explorer';
	if (agt.indexOf("netscape") != -1) return 'Netscape';
	if (agt.indexOf("mozilla/5.0") != -1) return 'Mozilla';
	if (agt.indexOf('\/') != -1) {
		if (agt.substr(0,agt.indexOf('\/')) != 'mozilla') {
			return navigator.userAgent.substr(0,agt.indexOf('\/'));}
			else return 'Netscape';} else if (agt.indexOf(' ') != -1)
			return navigator.userAgent.substr(0,agt.indexOf(' '));
			else return navigator.userAgent;
}