function popup_po_nahrani(){
	document.getElementById('popup_id').className = 'popup_visible';
	popup_pozice();
}

function popup_pozice() {
	sirka=document.body.clientWidth;
	if (sirka<883){
		document.getElementById('popup_id').style.left=0+'px';
	} else {
		pozice=(sirka-883)/2;
		document.getElementById('popup_id').style.left = pozice+'px';
	}
	
	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;
	}
	
	if (scrOfY<170){
		document.getElementById('popup_id').style.top = 170+'px';
		
	} else {
		document.getElementById('popup_id').style.top = (scrOfY)+'px';
	}
	
}
function zavrit(){
	document.getElementById("popup_id").className = 'popup_hidden';
}

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 ];
  return scrOfY;
}