window.onscroll = function() {
    if( window.XMLHttpRequest ) {
		if(navigator.platform == 'iPad' || navigator.platform == 'iPhone' || navigator.platform == 'iPhone Simulator' || navigator.platform == 'iPod') {
		} else {
			var wholeHeaderOffset1 = 160;
			if (document.documentElement.scrollTop > wholeHeaderOffset1 || self.pageYOffset > wholeHeaderOffset1) {
				$('#social_buttons').css('position','fixed');
				$('#social_buttons').css('top','10px');
			} else if (document.documentElement.scrollTop < wholeHeaderOffset1 || self.pageYOffset < wholeHeaderOffset1) {
				$('#social_buttons').css('position','static');
				$('#social_buttons').css('top','auto');
			}
		}
    }
}