function recenter_txt() {
    	var div_width = 300;
    	var browser_width = (document.body.offsetWidth ? document.body.offsetWidth : window.innerWidth);
    	var new_left = Math.round((browser_width - div_width) / 2);
    	if (new_left < 0) { new_left = 0; }
		$('#txt_pop').css('left',(new_left + 'px'));
}