function bgrsize() {
  var myWidth = 0, myHeight = 0;
  if( typeof( window.innerWidth ) == 'number' ) {
    //Non-IE
    myWidth = window.innerWidth;
    myHeight = window.innerHeight;
  } else if( document.documentElement && ( document.documentElement.clientWidth || document.documentElement.clientHeight ) ) {
    //IE 6+ in 'standards compliant mode'
    myWidth = document.documentElement.clientWidth;
    myHeight = document.documentElement.clientHeight;
  } else if( document.body && ( document.body.clientWidth || document.body.clientHeight ) ) {
    //IE 4 compatible
    myWidth = document.body.clientWidth;
    myHeight = document.body.clientHeight;
  }

  if( myWidth > 1460) {
  	document.body.style.backgroundImage="url('images/sommar2.jpg')";
  } else if( myWidth > 1700) {
  	document.body.style.backgroundImage="url('images/sommar3.jpg')";
  } else {
  	document.body.style.backgroundImage="url('images/sommar1.jpg')";
  }
}