// JavaScript Document
function isEmailAddr(email)
{
  var result = false
  var theStr = new String(email)
  var index = theStr.indexOf("@");
  if (index > 0)
  {
    var pindex = theStr.indexOf(".",index);
    if ((pindex > index+1) && (theStr.length > pindex+1))
	result = true;
  }
  return result;
}

function chkEform(form){
	if(form.sender.value == ""){
		alert('Please enter your name.');
		form.sender.focus();
		return false;
	}
	else if(form.sdremail.value != ""){
		if (!isEmailAddr(form.sdremail.value)){
			alert('Please enter a complete email address in the form: yourname@yourdomain.com');
			form.sdremail.value = "";
			form.sdremail.focus();
			return false;
		}	
	}
	if(form.sdremail.value == ""){
		alert('Please enter your email address.');
		form.sdremail.value = "";
		form.sdremail.focus();
		return false;
	}
	else if(form.subject.value == ""){
		alert('Please enter the subject of your message.');
		form.subject.value = "";
		form.subject.focus();
		return false;
	}
	else if(form.message.value == ""){
		alert('Please type in your message.');
		form.message.value = "";
		form.message.focus();
		return false;
	}
}//end function