function showhide_about() {
	document.getElementById('about').style.display = "block";
	document.getElementById('services').style.display = "none";
	document.getElementById('portfolio').style.display = "none";
	document.getElementById('related').style.display = "none";
	document.getElementById('contact').style.display = "none";
}

function showhide_services() {
	document.getElementById('about').style.display = "none";
	document.getElementById('services').style.display = "block";
	document.getElementById('portfolio').style.display = "none";
	document.getElementById('related').style.display = "none";
	document.getElementById('contact').style.display = "none";
}

function showhide_portfolio() {
	document.getElementById('about').style.display = "none";
	document.getElementById('services').style.display = "none";
	document.getElementById('portfolio').style.display = "block";
	document.getElementById('related').style.display = "none";
	document.getElementById('contact').style.display = "none";
}

function showhide_related() {
	document.getElementById('about').style.display = "none";
	document.getElementById('services').style.display = "none";
	document.getElementById('portfolio').style.display = "none";
	document.getElementById('related').style.display = "block";
	document.getElementById('contact').style.display = "none";
}

function showhide_contact() {
	document.getElementById('about').style.display = "none";
	document.getElementById('services').style.display = "none";
	document.getElementById('portfolio').style.display = "none";
	document.getElementById('related').style.display = "none";
	document.getElementById('contact').style.display = "block";
}