// JavaScript Document

function chksearchform(f)
{
	cu = f.cu_number.value;
	if(!cu=="")
	{
		if(!IsNumeric(cu))
		{
			alert("For Charter Number search, please enter DIGITS only.");
			f.cu_number.focus();
			return false;
		}
	}
	return true;
}

function IsNumeric(sText)

{
   var ValidChars = "0123456789";
   var IsNumber=true;
   var Char;

 
   for (i = 0; i < sText.length && IsNumber == true; i++) 
      { 
      Char = sText.charAt(i); 
      if (ValidChars.indexOf(Char) == -1) 
         {
         IsNumber = false;
         }
      }
   return IsNumber;
   
}