function agreement_check()
{
	if (document.upgrade_form.terms.checked == false)
	{
		alert("Please check the terms and condition box.");
		return false;
	}
	return true;
}


function validate_password_change()
{
	if (document.change_password.current_password.value == "")
	{
		alert("Please enter your current password.");
		document.change_password.current_password.focus();
		return false;
	}
	if (document.change_password.new_password.value == "")
	{
		alert ("Please enter your new password.");
		document.change_password.new_password.focus();
		return false;
	}
	if (document.change_password.reenter_password.value == "")
	{
		alert ("Please enter the verification password.");
		document.change_password.reenter_password.focus();
		return false;
	}
	if ((document.change_password.new_password.value.length) < 6 )
	{
		alert ("Your password must be at least 6 characters long. Please try again.");
		document.change_password.new_password.focus();
		return false;
	}
	if ((document.change_password.current_password.value) == (document.change_password.new_password.value))
	{
		alert("Please enter a different password.");
		document.change_password.new_password.focus();
		return false;
	}
	if (document.change_password.new_password.value != document.change_password.reenter_password.value)
	{
		alert("Your new password and password verification don't match. Please try again.");
		return false;
	}
	return true;
}


function pay_form_check()
{
	if(document.form.name.value.match(/\s/g))
	{
		document.form.name.focus();
		alert('Sorry, user name is not allowed to have any spaces.');
		return false;
	}
	if (document.form.name.value == "")
	{
		document.form.name.focus();
		alert("Please enter your name.");
		return false;
	}
	if (document.form.password.value == "")
	{
		document.form.password.focus();
		alert("Please enter your password.");
		return false;
	}
	if (document.form.password.value.match(/\s/g))
	{
		document.form.password.focus();
		alert("Sorry, Password is not allowed to have any spaces");
		return false;
	}
	if (document.form.password.value.length < 6)
	{
		document.form.password.focus();
		alert("Please enter a password that is at lease 6 characters in length.");
		return false;
	}
	if (document.form.email.value == "")
	{
		document.form.email.focus();
		alert("Please enter your email.");
		return false;
	}
	if (document.form.age.value == "")
	{
		document.form.age.focus();
		alert("Please enter your age.");
		return false;
	}
	
	var email = document.form.email.value;
	if (!((email.indexOf(".") > 2) && (email.indexOf("@") > 0)))
	{
		document.form.email.focus();
		alert ("Please enter a valid email address.");
		return false;
	}
	
	var val = document.form.age.value ;
	for (i = 0 ; i < val.length; i++) 
	{
		if ((val.charAt(i) < '0') || (val.charAt(i) > '9'))
		{
			document.form.age.focus();
			alert("Please enter a valid age value (23).");
			return false;
		}
 	}
	
    var ret = !isNaN(val);
 
    if (!ret)
	{
        alert("Please enter a valid age.");
		return false;
    }

	if (document.form.name.value.length < 5 )
	{
		document.form.name.focus();
		alert ("Please enter a name that is at least 5 characters long.");
		return false;
	}
	
	if (document.form.sex[0].checked == false && document.form.sex[1].checked == false)
	{
		alert("Please check the boy or girl check box.");
		return false;
	}
	
	if (document.form.terms.checked == false)
	{
		alert("Please check the terms and condition box.");
		return false;
	}
	
	if (document.form.period.options[document.form.period.selectedIndex].value == 0)
	{
		alert("Please choose a subscription period.");
		return false;
	}
	return true;
}
<!--
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_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 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_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];}
}
//-->