/**
 * Generic functions
 */

function isArray(obj)
{
   if (obj.constructor.toString().indexOf("Array") == -1)
      return false;
   else
      return true;
}

function getElementsByClassName(oElm, strTagName, strClassName){
        var arrElements = (strTagName == "*" && document.all)? document.all :
        oElm.getElementsByTagName(strTagName);
        var arrReturnElements = new Array();
        strClassName = strClassName.replace(/\-/g, "\\-");
        var oRegExp = new RegExp("(^|\\s)" + strClassName + "(\\s|$)");
        var oElement;
        for(var i=0; i<arrElements.length; i++){
                oElement = arrElements[i];
                if(oRegExp.test(oElement.className)){
                        arrReturnElements.push(oElement);
                }
        }
        return (arrReturnElements)
}

function trim(str)
{
        while(''+str.charAt(0)==' ')
                str=str.substring(1,str.length);
        while(''+str.charAt(str.length-1)==' ')
                str=str.substring(0,str.length-1);
        return str;
}

/**
 * Validation related functions
 */

function showError(id)
{
        document.getElementById(id+'_error').style.visibility='visible';
}

function hideError(id)
{
        document.getElementById(id+'_error').style.visibility='hidden';
}

function appendError(text,errordiv)
{
        listNode = document.getElementById(errordiv+'_ul');
        itemNode = document.createElement('li');
        itemNode.appendChild(document.createTextNode(text));
        listNode.appendChild(itemNode);
}