function disableReturnKey(evt) {
  var evt = (evt) ? evt : ((event) ? event : null);
  var element = (evt.target) ? evt.target : ((evt.srcElement) ? evt.srcElement : null);
  if ((evt.keyCode == 13) && (element.type=="text" || element.type == "checkbox"|| element.type == "file"|| element.type == "radio"))  {return false;}
}

document.onkeypress = disableReturnKey;

function AddLanguagePair(){
	var container = document.getElementById('tbLanguages');
	var itemsCount = container.value.split(';').length; 			
	var selectLangFrom = document.getElementById('selectLangFrom');
	var selectLangTo= document.getElementById('selectLangTo');
	
	var langFromId=selectLangFrom.value;
	var langToId=selectLangTo.value;
	
	var langFrom = selectLangFrom.options[selectLangFrom.selectedIndex].text;
	var langTo = selectLangTo.options[selectLangTo.selectedIndex].text;
	if(langFrom.length>0&&langTo.length>0){			
		var str = itemsCount + ". "+ langFrom + " -> " + langTo + ";\n";	
		container.value += str;	
    }
}


function AddLanguage(){
	var container = document.getElementById('tbLanguages');
	var itemsCount = container.value.split(';').length; 			
	var selectLangFrom = document.getElementById('selectLangFrom');	
	var langFromId=selectLangFrom.value;	
	var langFrom = selectLangFrom.options[selectLangFrom.selectedIndex].text;
	if(langFrom.length>0){
		var str = itemsCount + ". " + langFrom + ";\n";		
		container.value += str;
	}	
}

function clearTextArea(textareaId){
	var textarea = document.getElementById(textareaId);
	if(textarea!=null){
		textarea.value = '';
	}
	return false;
}

function isNumberKey(evt)
      {
         var charCode = (evt.which) ? evt.which : event.keyCode;
         if (charCode > 31 && (charCode < 48 || charCode > 57)&& charCode !=44 && charCode !=46)
            return false;
         return true;
      }
function isDigitsKey(evt)
      {
         var charCode = (evt.which) ? evt.which : event.keyCode;
         if (charCode < 48 || charCode > 57)
            return false;
         return true;
      }
function disableForm()
{
 var count = document.forms[0].elements.length; 
 for (i=0; i<count; i++)
  {
    var element = document.forms[0].elements[i]; 
	if (element.type == "text" ||element.type == "image" ||element.type == "file" ||element.type == "select-one" || element.type == "checkbox" || element.type == "textarea"|| element.type == "button"|| element.type == "radio"|| element.type == "password") 
	{ 
		element.disabled='disabled'; 
	}
	else{
	var el = element;
	} 
  } 
}