/////////////////////////////////////////////////////////
///  GENERAL IMAGE SWAP 
///  (e.g. 'Contact' & 'Seattle site', on home page)
/////////////////////////////////////////////////////////	
function swapImage(imageId, type) {
	if (type == 'on')
	{
		imageId.src = imageId.src.replace('_o.gif', '.gif');
		imageId.src = imageId.src.replace('.gif', '_o.gif');
	}	
	else
		imageId.src = imageId.src.replace('_o.gif', '.gif');				
}


function swapArrowImage(imgNum, type) {

	var imgObj; 
	
	//image object
	if(ns4){
		imgObj = document.layers['navlayer'].document.images[imgNum];
	}else{
		imgObj = document.images[imgNum];
	}
	
	if (type == 'on')
		imgObj.src = imgObj.src.replace('.gif', '_o.gif');
	else
		imgObj.src = imgObj.src.replace('_o.gif', '.gif');				
}