var vyska=1;
var sirka=1;
nastav(); 
function nastav() {
	var vyska2=vyska;
	var sirka2=sirka;
	sirka=document.documentElement.clientWidth;
	vyska=document.documentElement.clientHeight;
	if((vyska!=vyska2)||(sirka!=sirka2)) {
  	  if(document.documentElement.clientWidth > 900) {document.getElementById("hlavni").style.left=Math.ceil(document.documentElement.clientWidth/2-450)+"px";}
      else {document.getElementById("hlavni").style.left="0px";}
	  if (document.documentElement.clientHeight > 600) {document.getElementById("hlavni").style.top=Math.ceil(document.documentElement.clientHeight/2-300)+"px";}
	  else {document.getElementById("hlavni").style.top="0px";}
	  }
    setTimeout("nastav()",1000);
	}

function ZvetsiObrazek(src,sirka,vyska) {
   var posuvnik="no";
   if((window.screen.width)&&(window.screen.height)) {
      if(window.screen.width<sirka) {
	    sirka=eval(window.screen.width)-20;
		vyska=eval(vyska)+20;
		posuvnik="yes";

		}
	  if(window.screen.height<vyska) {
		vyska=eval(window.screen.height)-20;
		posuvnik="yes";
		sirka=eval(sirka)+20;
	    }
   }
   window.open("vyskakovaci2.html?src="+src, "_blank", "toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars="+posuvnik+",resizable,width="+sirka+",height="+vyska+",left=10,top=10");
   return true;
}