function checkCB(comp, cnt, limit, error, cbid) {
  actCnt = 0;

  if (limit>0) {
    for (i=0; i<cnt; i++) {
  	  if (document.getElementById("id__"+comp+"_"+(i+1)).checked) {
  	  	actCnt++;
  	  }
    }
    
    if (actCnt>limit) {
    	document.getElementById("id__"+comp+"_"+cbid).checked = false;
    	alert(error);
    }
  }
}

function markInputByID(element_id) {
	document.getElementById(element_id).checked = !document.getElementById(element_id).checked
}