var winW, winH;

function dajrozmery() {
  if( typeof( window.innerWidth ) == 'number' ) {
    //Non-IE
    winW = window.innerWidth;
    winH = window.innerHeight;
  } else if( document.documentElement && ( document.documentElement.clientWidth || document.documentElement.clientHeight ) ) {
    //IE 6+ in 'standards compliant mode'
    winW = document.documentElement.clientWidth;
    winH = document.documentElement.clientHeight;
  } else if( document.body && ( document.body.clientWidth || document.body.clientHeight ) ) {
    //IE 4 compatible
    winW = document.body.clientWidth;
    winH = document.body.clientHeight;
  }
}


function showpict(file,wid,hei) {
   dajrozmery();
   var scroll=getScrollXY();
   var ele = document.getElementById('fotka');
   ele.innerHTML='<img src="'+file+'"></img>';
   ele.style.top=Math.round((winH-hei)/2)+scroll[1]+'px';
   ele.style.left=Math.round((winW-wid)/2)+'px';
   ele.style.visibility='visible';
}

function getScrollXY() {
  var scrOfX = 0, scrOfY = 0;
  if( typeof( window.pageYOffset ) == 'number' ) {
    //Netscape compliant
    scrOfY = window.pageYOffset;
    scrOfX = window.pageXOffset;
  } else if( document.body && ( document.body.scrollLeft || document.body.scrollTop ) ) {
    //DOM compliant
    scrOfY = document.body.scrollTop;
    scrOfX = document.body.scrollLeft;
  } else if( document.documentElement && ( document.documentElement.scrollLeft || document.documentElement.scrollTop ) ) {
    //IE6 standards compliant mode
    scrOfY = document.documentElement.scrollTop;
    scrOfX = document.documentElement.scrollLeft;
  }
  return [ scrOfX, scrOfY ];
}