var s = 0;
function counter(el, i, counter) {
  if (el.value.length <= i){ 
    s = 0;
  }   
  if (el.value.length <= (i+s)){
	counter.innerHTML = el.value.length + "/" + i;
  }
  else {
  alert("Maximální délka příspěvku je 600 znaků!");
  s = (el.value.length-i);
  }	
}
var exW = window.exW;   
function OpenExl(link,winName)
{
      var retValue=true;
      if (exW!=null && !exW.closed)
      {
        exW.focus();
        exW.location.href=link.href;
      }
      else
      {
        exW=window.open(link.href,winName);
        if (exW==null || typeof(exW)=="undefined")
          retValue=false;
        else
        {
          link.target=winName;
          exW.focus();
        }
      }
      return retValue;
}
function validForm() {
	document.getElementById('form').action='/diskuse/send.php';
	return true;
}
function setContentHeight(no) {
var hght;
var content = document.getElementById("contmdl");
var lft = document.getElementById("lcol");
var lftHeight = lft.offsetHeight;  
var mdlno = "rmid" + no;
var mdl = document.getElementById(mdlno);
var mdlHeight = mdl.offsetHeight; 
    if (window.innerHeight) {
      hght = window.innerHeight;
    }
    else if (document.documentElement && document.documentElement.clientHeight) {
      hght = document.documentElement.clientHeight;
    }
    else if (document.body && document.body.clientHeight) {
      hght = document.body.clientHeight;
    }

    if (document.body.scrollHeight <= hght) 
    {
      content.style.height = (hght - 255) + 'px';
      mdl.style.height = (hght - 330) + 'px';
      mdlHeight = mdl.offsetHeight;
    }
    else if (mdlHeight < lftHeight) {
      mdl.style.height = (lftHeight + 20) + 'px';    
    }
}