var width=0;
if (self.screen) {     // for NN4 and IE4
        width = screen.width
}
else if (self.java) {   // for NN3 with enabled Java
       var jkit = java.awt.Toolkit.getDefaultToolkit();
       var scrsize = jkit.getScreenSize();       
       width = scrsize.width; 
}
//alert(width);
if (width < 1024) {
document.write("<link rel='stylesheet' type='text/css' href='/bitrix/templates/books_copy/template_styles.css'>");
}else if(width == 1024){
document.write("<link rel='stylesheet' type='text/css' href='/bitrix/templates/books_copy/template_styles-1.css'>");
}