var width = screen.width;
var res =(((!(640-width))*1)+((!(800-width))*2)+((!(1024-width))*3)+((!(1152-width))*4)+((!(1280-width))*5)+((!(1600-width))*6));
 if(!(res)) {res = 1};
 if (res=='1') {cssfile='res_640.css';}
 if (res=='2') {cssfile='res_800.css';}
 if (res=='3') {cssfile='res_1024.css';}
 if (res!='1' && res!='2' && res!='3') {cssfile='res_other.css';}
document.write('<link rel="stylesheet" type="text/css" href="' +cssfile+'" />');