function numbersonlyInt(myfield, e)
{
    var key;
    var keychar;

    if (window.event)
      key = window.event.keyCode;
    else if (e)
      key = e.which;
    else
      return true;
    keychar = String.fromCharCode(key);
    
    // control keys
      if ((key==null) || (key==0) || (key==8) || 
        (key==9) || (key==13) || (key==27) )
      return true;
    
    // numbers
    else if ((("0123456789").indexOf(keychar) > -1))
      return true;
        
    else
      return false;
}  
function IsEmpty(aTextField) {
   
   if ((aTextField==null) || (aTextField.value.length==0))
      { 
      return true;
      }
   else{ 
      
      return false;
      } 
}	

function ValidateForm(form)
{

   if(IsEmpty(form.amount)) 
   { 
      alert('You have not entered an amount') 
      form.amount.focus(); 
      return false; 
   } 
  
return true;
 
}