var myImages = new Array();
myImages[0] = new Image( 73 , 62 );
myImages[0].src = "/images/navigation/home_button.png";
myImages[1] = new Image( 73 , 62 );
myImages[1].src = "/images/navigation/home_button_roll.png";
myImages[2] = new Image( 98 , 62 );
myImages[2].src = "/images/navigation/services_button.png";
myImages[3] = new Image( 98 , 62 );
myImages[3].src = "/images/navigation/services_button_roll.png";
myImages[4] = new Image( 105 , 62 );
myImages[4].src = "/images/navigation/products_button.png";
myImages[5] = new Image( 105 , 62 );
myImages[5].src = "/images/navigation/products_button_roll.png";
myImages[6] = new Image( 111 , 62 );
myImages[6].src = "/images/navigation/equipment_button.png";
myImages[7] = new Image( 111 , 62 );
myImages[7].src = "/images/navigation/equipment_button_roll.png";
myImages[8] = new Image( 148 , 62 );
myImages[8].src = "/images/navigation/press_button.png";
myImages[9] = new Image( 148 , 62 );
myImages[9].src = "/images/navigation/press_button_roll.png";
myImages[10] = new Image( 89 , 62 );
myImages[10].src = "/images/navigation/gallery_button.png";
myImages[11] = new Image( 89 , 62 );
myImages[11].src = "/images/navigation/gallery_button_roll.png";
myImages[12] = new Image( 71 , 62 );
myImages[12].src = "/images/navigation/links_button.png";
myImages[13] = new Image( 71 , 62 );
myImages[13].src = "/images/navigation/links_button_roll.png";
myImages[14] = new Image( 107 , 62 );
myImages[14].src = "/images/navigation/contact_button.png";
myImages[15] = new Image( 107 , 62 );
myImages[15].src = "/images/navigation/contact_button_roll.png";

function swapImage( imgID , index )
{
	document.getElementById(imgID).src = myImages[index].src;
}


var currentlyVisible = 'CityProjects';
function unhide( clicked )
{	
	//  If the user clicked a category that is already visible
	if( clicked == currentlyVisible )
	{
		return true;
	}
	else
	{
		document.getElementById( clicked ).style.display = 'block';
		document.getElementById( currentlyVisible ).style.display = 'none';
		currentlyVisible = clicked;
	}
}