function initNav( varLink ) {
	if( !varLink ) varLink = "Home";
	myNav = document.getElementById( "nav" );
	myItems = myNav.getElementsByTagName( "li" );

	for ( x = 0; x < myItems.length; x++ ) {
		myItem = myItems[x];
		myLink = myItem.getElementsByTagName( "a" )[0];
		myLink.onclick = changeHeaderAndContent;
		myLink.className = ( String( myLink.rel ) == varLink ? "currentNav" : "" );
	}
}

function changeHeaderAndContent( varSet ) {
	myTitle = ( typeof varSet == "string" ? varSet : String( this.rel ) );
	changeElement( myTitle, "header" );
	changeElement( myTitle, "main" );
	initNav( myTitle );
}

function changeElement( element, container ) {
	hideElements( container );
	myElement = document.getElementById( container + element );
	myElement.style.display = "block";
}

function hideElements( container ) {
	myElements = document.getElementById( container ).getElementsByTagName( "div" );
	for( x = 0; x < myElements.length; x++ ) {
		myElement = myElements[x];
		if( String( myElement.id.indexOf( "Column" ) ) == -1  )
			myElement.style.display = "none";
	}
}

initNav();