function isEmail (strEmail)
{
    var emailReg = /^[_a-z0-9]+@([_a-z0-9]+\.)+[a-z0-9]{2,5}$/i; 
    if(emailReg.test(strEmail)) return true; 
    return false; 
}

function isNumberic (strNumber)
{
    var numReg = /[0-9]{1,}/;
    if(numReg.test(strNumber)) return true; 
    return false; 
}
function $() {
  var elements = new Array();
  
  for ( var i = 0; i < arguments.length; i++) {
    var element = arguments[i];
    if (typeof element == 'string')
      element = document.getElementById(element);

    if (arguments.length == 1) 
      return element;
      
    elements.push(element);
  }
  
  return elements;
}
function swap(s,a,b,c){$(s)[a]=$(s)[a]==b?c:b;}
function hide(s){$(s).style.display=$(s).style.display=="none"?"":"none";}