/* usage

*/

function fond() {
   var sw = screen.width;
   var img = "800_600";
   if (sw>=1024) img = "1024_768";
   if (sw>=1280) img = "1280_1024";
   if (sw>=1600) img = "1600_1200";
   if (sw>=1920) img = "1920_1440";
   /*document.body.style.background="url(IMG/jpg/"+img+".jpg) no-repeat center center"*/
   }


function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = func;
  } else {
    window.onload = function() {
      if (oldonload) {
        oldonload();
      }
      func();
    }
  }
}

addLoadEvent(function() {
  fond();
});