if (screen.width <= 700) {
   document.write('<style type=text/css>@import url(dogsml.css);</style>');
	 }
if ((screen.width > 700) && (screen.width <= 980)) {
   document.write('<style type=text/css>@import url(dognorm.css);</style>');
	 }
if ((screen.width > 980) && (screen.width <= 1120)) {
   document.write('<style type=text/css>@import url(dogmed.css);</style>');
	 }
if (screen.width > 1120) {
   document.write('<style type=text/css>@import url(doghuge.css);</style>');
	 }