function IsEmpty(s)
{
	if(trim(s) == "")
	{
		return true;
	}
	else
	{
		return false;
	}
}
			
	function trim(s) 
	{
	  while (s.substring(0,1) == ' ') 
	  {
	    s = s.substring(1,s.length);
	  }
	  while (s.substring(s.length-1,s.length) == ' ') 
	  {
	    s = s.substring(0,s.length-1);
	  }
	  return s;
	}


function chkEmail(s)
	{
	  var a = false;
	  var res = false;
	  if(typeof(RegExp) == 'function')
	    {
	    var b = new RegExp('abc');
	    if(b.test('abc') == true){a = true;}
	    }
	
	  if(a == true)
	    {
	    reg = new RegExp('^([a-zA-Z0-9\\-\\.\\_]+)'+
	                     '(\\@)([a-zA-Z0-9\\-\\.]+)'+
	                     '(\\.)([a-zA-Z]{2,4})$');
	    res = (reg.test(s));
	    }
	  else
	    {
	    res = (s.search('@') >= 1 &&
	           s.lastIndexOf('.') > s.search('@') &&
	           s.lastIndexOf('.') >= s.length-5)
	    }
	  return(res);
	  
	}