setTimeout("change_header(2)",10000);
function change_header(Num)
	{
	document.getElementById("header").src="images/pic"+Num+".png";
	if (Num==1)
		{setTimeout("change_header(2)",10000);}
	else if (Num==2)
		{setTimeout("change_header(3)",10000);}
	else if (Num=3)
		{setTimeout("change_header(1)",10000);}
	}
	
function validate_required(field,alerttxt)
	{
	with (field)
		{
		if (value==null||value=="")
			{
			alert(alerttxt);return false;
			}
		else
			{
			return true;
			}
		}
	}
	
function validate_email(field,alerttxt)
	{
	with (field)
		{
		apos=value.indexOf("@");
		dotpos=value.lastIndexOf(".");
		if (apos<1||dotpos-apos<2)
			{alert(alerttxt);return false;}
		else {return true;}
		}
	}
	
function validate_form(thisform)
	{
	with (thisform)
		{
		if (validate_required(name,"Please enter your name.")==false)
			{name.focus();return false;}
		else if (validate_email(email,"Please enter a valid e-mail address.")==false)
			{email.focus();return false;}
		else if (validate_required(website,"Please enter your website.")==false)
			{website.focus();return false;}
		else if (validate_required(orgname,"Please enter your organization's name.")==false)
			{orgname.focus();return false;}
		else if (validate_required(siteuse,"Please enter your site usage.")==false)
			{siteuse.focus();return false;}
		else if (validate_required(pages,"Please enter the number of pages.")==false)
			{pages.focus();return false;}
		else if (validate_required(deadline,"Please enter your deadline.")==false)
			{deadline.focus();return false;}
		else if (validate_required(additional,"Please enter any additional information.")==false)
			{additional.focus();return false;}
		}
	}