function switchMenu(id) {
		if (document.getElementById) {
			var subNavDiv = document.getElementById(id);
			subNavDiv.style.display = (subNavDiv.style.display == 'block') ? 'none' : 'block';
		}
	}
	function hideMenu(id) {
		if (document.getElementById) document.getElementById(id).style.display = 'none';
	}

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 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 otherStateCheck() {
   vState = document.register.StateProvince;
   if ( vState.selectedIndex != -1 && vState.options[vState.selectedIndex].value == 'OTHER' ) {
		toggleLayer('otherStateDiv');
      return false;
   }
	return true;
}

function toggleLayer(whichLayer) {
	if (document.getElementById) {
		// this is the way the standards work
		var style2 = document.getElementById(whichLayer).style;
		style2.display = style2.display? "":"block";
	}
	else if (document.all) {
		// this is the way old msie versions work
		var style2 = document.all[whichLayer].style;
		style2.display = style2.display? "":"block";
	}
	else if (document.layers) {
		// this is the way nn4 works
		var style2 = document.layers[whichLayer].style;
		style2.display = style2.display? "":"block";
	}
}

function DataValidation() {
	if (document.register.FirstName.value == "") {
      alert("Please supply a full name.");
      return false;
   }
	if (document.register.LastName.value == "") {
      alert("Please supply a full name.");
      return false;
   }
   if (document.register.Title.value == "") {
      alert("Please supply a job title.");
      return false;
   }
   if (document.register.CompanyName.value == "") {
      alert("Please supply an institution name.");
      return false;
   }
   var myCompanyType = document.register.CompanyType.selectedIndex;
	if (myCompanyType == 0) {
		alert("Please select an option under 'What Are You?'");
		document.register.CompanyType.focus();
		return false;
	}
   if (document.register.Street1.value == "") {
      alert("Please supply a street address.");
      return false;
   }
   if (document.register.City.value == "") {
      alert("Please supply a city.");
      return false;
   }
   if (document.register.PostalCode.value == "") {
      alert("Please supply a zip or postal code.");
      return false;
   }
   var myCountry = document.register.CountryName.selectedIndex;
   var myState = document.register.StateProvince.selectedIndex;
	if (myCountry == 0) {
		alert("Please supply a country or region.");
		document.register.CountryName.focus();
		return false;
	} else {
		if ( document.register.CountryName.options[myCountry].value == 'United States' || document.register.CountryName.options[myCountry].value == 'Canada' ) {
			if (myState == 0 ) {
				alert("Please supply a valid state or province.");
				document.register.StateProvince.focus();
				return false;
			}
		}
   }
	if ( document.register.StateProvince.options[myState].value == 'OTHER' ) {
		if (document.register.otherState.value == "" || document.register.otherState.value == "provide other") {
			alert("Please supply a valid state or province. (other)");
			return false;
		}	
	}
   if (document.register.EmailAddress.value == "") {
      alert("Please supply a valid e-mail address.");
      return false;
   }
   var myLeadSource = document.register.LeadSource.selectedIndex;
	if (myLeadSource == 0) {
		alert("Please select an option under 'How Did You Hear About Us?'");
		document.register.LeadSource.focus();
		return false;
	}
   if (!document.register.wpPrint.checked && !document.register.wpOnline.checked && !document.register.wpBBAS.checked) {
      alert("Please select at least one product you're interested in.");
      return false;
   }
   return true;
}