// function to validate input
function checkInput() {
  var missing=focusVal=""
  df=document.forms[0]
  arg_num = arguments.length
  j=1
  for(i=0;i<arg_num;i=i+2) {
     current_val = eval("df."+arguments[i]+".value")
     if ( current_val == "" ) {
            missing += "- " + arguments[j] + "\n"
        if ( focusVal=="" ) focusVal = arguments[i]
         }
         j=j+2
  }
  if (df.confirm) { 
  	if (df.confirm.value != df.email.value) missing += "- Emails do not match\n"
  } 
  if (missing != "") {
    alert("The following information is required:\n"+missing)
    eval("df."+focusVal+".focus()")
    return false
  }
}