var myWidth = 0, myHeight = 0;
  if( typeof( window.innerWidth ) == 'number' ) {
    //Non-IE
    myWidth = window.innerWidth;
  } else if( document.documentElement && ( document.documentElement.clientWidth || document.documentElement.clientHeight ) ) {
    //IE 6+ in 'standards compliant mode'
    myWidth = document.documentElement.clientWidth+20;
  } else if( document.body && ( document.body.clientWidth || document.body.clientHeight ) ) {
    //IE 4 compatible
    myWidth = document.body.clientWidth+20;
  }
  if ( myWidth < 1000 ) { document.write("<link href=\"http://waiyin.comuv.com/playground_site/styles/screen_800.css\" rel=\"stylesheet\" type=\"text/css\" />") }
  else { document.write("<link href=\"http://waiyin.comuv.com/playground_site/styles/screen_1024.css\" rel=\"stylesheet\" type=\"text/css\" />") }