function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}
function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}
function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}
function validate (s)
{   
	//Basic Checks
	if (s.name.value=="") { alert("Please enter your name."); s.name.focus(); return false; }
	var inside = s.email.value;
	if (inside=="") {alert("Please enter an email address to allow us to reply to your query!");s.email.focus();return false;}
    var i = 1;
    var sLength = inside.length;
    while ((i < sLength) && (inside.charAt(i) != "@"))
    { i++
    }
    if ((i >= sLength) || (inside.charAt(i) != "@")) {alert("Please enter a valid email address.");s.email.focus(); return false;}
    else i += 2;
    // look for .
    while ((i < sLength) && (inside.charAt(i) != "."))
    { i++
    }
	if (document.location.href.indexOf("contactus") > -1)
	{
		if (s.message.value=="") { alert("Please enter your message."); s.message.focus(); return false; }		
		return true;
	}
    // there must be at least one character after the .
    if ((i >= sLength - 1) || (inside.charAt(i) != ".")) {alert("Please enter a valid email address.");s.email.focus(); return false;}
	if (s.gender.options[s.gender.selectedIndex].value=="") { alert("Please select your gender."); s.gender.focus(); return false; }
	if (s.age.value=="") { alert("Please enter your age."); s.age.focus(); return false; }	
	if (isNaN(parseInt(s.age.value))) { alert("Please enter a valid age."); s.age.focus(); return false; }
	if (s.education_level.value=="") { alert("Please enter your education level."); s.education_level.focus(); return false; }
	if (document.location.href.indexOf("student_reg") == -1)
	{//tutor
		if (s.teaching_experience.value=="") { alert("Please enter your Teaching Experience(s)."); s.teaching_experience.focus(); return false; }
		if (s.preferred_location.value=="") { alert("Please enter your Preferred Location(s)."); s.preferred_location.focus(); return false; }
		if (s.preferred_time_slot.value=="") { alert("Please enter your Preferred Time Slot(s)."); s.preferred_time_slot.focus(); return false; }
	}
	else
	{//stud
		if (s.contact_number.value=="") { alert("Please enter your Contact Number."); s.contact_number.focus(); return false; }
		if (s.address.value=="") { alert("Please enter your address."); s.address.focus(); return false; }		
		if (s.subjects_requested.value=="") { alert("Please enter the Subject(s) Requested."); s.subjects_requested.focus(); return false; }		
		if (s.preferred_timeslot.value=="") { alert("Please enter your Preferred Time Slot(s)."); s.preferred_timeslot.focus(); return false; }
		if (s.special_request.value=="") { alert("Please enter any special request(s) you might have, if not enter 'none'."); s.special_request.focus(); return false; }		
	}
	return true;
}