function showTab(tab) {
	var linkSet = "linkSet" + tab;
	var content = "tabContent" + tab;
	var icon = "tabIcon" + tab;
	var slideshow = "slideshow" + tab;
	for(i=1;i<5;i++) {
		var tabNum = "linkSet" + i;
		var tabContentNum = "tabContent" + i;
		var tabIconNum = "tabIcon" + i;
		var slideshowNum = "slideshow" + i;
		document.getElementById(tabNum).style.display = 'none';
		document.getElementById(tabContentNum).style.display = 'none';
		document.getElementById(tabIconNum).style.display = 'none';
		document.getElementById(slideshowNum).style.display = 'none';
	}
	document.getElementById(linkSet).style.display = 'block';
	document.getElementById(content).style.display = 'block';
	document.getElementById(icon).style.display = 'block';
	document.getElementById(slideshow).style.display = 'block';
}

function chkForm()
	{
	var errors = "";
	if (document.getElementById('frmContact').txtName.value == "")
		{
		errors = errors + "Name\n";
		}
	if (document.getElementById('frmContact').txtEmail.value == "")
		{
		errors = errors + "Email\n";
		}
	else
		{
		var invalidEmail = validate('frmContact','txtEmail');	
		}
	if (document.getElementById('frmContact').txtTel.value == "")
		{
		errors = errors + "Telephone\n";
		}
	if (document.getElementById('frmContact').txtMessage.value == "")
		{
		errors = errors + "Message\n";
		}
	 if (errors == "" && invalidEmail != false)
		{
		document.getElementById('frmContact').submit();
		/*document.getElementById('contactStart').style.display = 'none';
		document.getElementById('contactConfirm').style.display = 'block';*/
		}
	else if(errors != "")
		{
	  var msg = "Please enter the following missing information:\n\n" + errors;
	  alert (msg);
	  return false;
		}
	}
	
function validate(form_id,email) {
   var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
   var address = document.forms[form_id].elements[email].value;
   if(reg.test(address) == false) {
      alert('Invalid Email Address');
      return false;
   }
}