$(window).resize(function() {
	if($(window).width() <= 680){
		$('.full_width').css({
			width: '680px'
		});
	} else {
		$('.full_width').css({
			width: '100%'
		});
	}
});

$(window).load(function () {
	if($(window).width() <= 680){
		$('.full_width').css({
			width: '680px'
		});
	} else {
		$('.full_width').css({
			width: '100%'
		});
	}
});