function check_pdf_form() { 
    ischecked = false;
    for(i=0; i<document.forms[0].elements.length; i++) {
        if(document.forms[0].elements[i].type=="checkbox") {
            ischecked = ischecked || document.forms[0].elements[i].checked;
	}
    }
    if (ischecked) {
	return true;
    }
    alert("Please select a category.");	
    return false;		
}

function echeck(str) {
	var at="@"
	var dot="."
	var lat=str.indexOf(at)
	var lstr=str.length
	var ldot=str.indexOf(dot)
	if (str.indexOf(at)==-1){
		return false
	}
	if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		return false
	}

	if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		return false
	}

	if (str.indexOf(at,(lat+1))!=-1){
		return false
	}

	if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		return false
	}

	if (str.indexOf(dot,(lat+2))==-1){
		return false
	}

	if (str.indexOf(" ")!=-1){
		return false
	}
  return true;
}

function check_reg_form() { 
  if (document.getElementById("username").value == "") {
      alert("Username is a required field.");
      document.getElementById("username").focus();
      return false;
   }
 
   if (document.getElementById("email_address").value == "") {
	alert("Email address is a required field.");
	document.getElementById("email_address").focus();
	return false;
   }


  if (echeck(document.getElementById("email_address").value)==false){
	alert("Invalid Email address.");
	document.getElementById("email_address").focus();
	return false;
   }

   if (document.getElementById("password").value == "") {
       alert("Password is a required field.");
       document.getElementById("password").focus();
       return false;
   }

   if (document.getElementById("conf-password").value == "") {
       alert("Please confirm your password.");
	document.getElementById("conf-password").focus();
	return false;
   }

    if (document.getElementById("conf-password").value != document.getElementById("password").value) {
	alert("The two passwords do not match.");
	document.getElementById("password").focus();
	return false;
    }

   if (document.getElementById("grade").selectedIndex < 1) {
       alert("Please select a grade.");
       document.getElementById("grade").focus();
       return false;
   }
   if (document.getElementById("grade").selectedIndex > 5) {
       alert("Please select a grade.");
       document.getElementById("grade").focus();
       return false;
   }

   if (!(document.getElementById("terms").checked)) {
	alert("You must agree with our terms and privacy policy.");
	document.getElementById("terms").focus();
	return false;
    }

    return true;
}

function readCookie(name) {
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++) {
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
        } 
	return null;
}