function swapNavLink(a,b){
		document.images[a].src = "../images/newnav/" + a + '_' + b + ".gif"
}


function hideGSubnav(){
	// hide all
	if (document.layers){
		document.layers["gsubsearch"].visibility = "hide";
		document.layers["gsubbrowse"].visibility = "hide";
		document.layers["gsubideas"].visibility = "hide";
	}
	else{
		if (document.all){
			document.all("gsubsearch").style.visibility = "hidden";
			document.all("gsubbrowse").style.visibility = "hidden";
			document.all("gsubideas").style.visibility = "hidden";
		}
		else{
			document.getElementById("gsubsearch").style.visibility = "hidden";
			document.getElementById("gsubbrowse").style.visibility = "hidden";
			document.getElementById("gsubideas").style.visibility = "hidden";
		}
	}
}

function displayGSubnav(subDiv){
	
	hideGSubnav();
	
	//display selected
	
	if (document.layers){
		eval('document.layers["'+subDiv+'"].visibility = "show"');
	}
	else{
		if (document.all){
			document.all(subDiv).style.visibility = "visible";
		}
		else{
			document.getElementById(subDiv).style.visibility = "visible";
		}
	}
}

function roll(){
//do nothing.
}

/* formerly the separate homenav.js file */

function swapLinkGraphic(a,b){
	document.images[a].src = "images/" + a + '_' + b + ".gif"
}
function displayRHS(rhsDiv){
	
	// hide all
	if (document.layers){
	//alert ('howdy');
		document.layers["rhsdefault"].visibility = "hide";
		document.layers["rhssearch"].visibility = "hide";
		document.layers["rhsbrowse"].visibility = "hide";
		document.layers["rhsideas"].visibility = "hide";
		document.layers["rhspurchase"].visibility = "hide";
		// v2.1 document.layers["rhscatalogue"].visibility = "hide";
	}
	else{
		if (document.all){
			document.all("rhsdefault").style.visibility = "hidden";
			document.all("rhssearch").style.visibility = "hidden";
			document.all("rhsbrowse").style.visibility = "hidden";
			document.all("rhsideas").style.visibility = "hidden";
			document.all("rhspurchase").style.visibility = "hidden";
			// v2.1 document.all("rhscatalogue").style.visibility = "hidden";
		}
		else{
			document.getElementById("rhsdefault").style.visibility = "hidden";
			document.getElementById("rhssearch").style.visibility = "hidden";
			document.getElementById("rhsbrowse").style.visibility = "hidden";
			document.getElementById("rhsideas").style.visibility = "hidden";
			document.getElementById("rhspurchase").style.visibility = "hidden";
			// v2.1 document.getElementById("rhscatalogue").style.visibility = "hidden";
		}
	}
	
	
	//display selected
	
	if (document.layers){
		eval('document.layers["'+rhsDiv+'"].visibility = "show"');
	}
	else{
		if (document.all){
			document.all(rhsDiv).style.visibility = "visible";
		}
		else{
			document.getElementById(rhsDiv).style.visibility = "visible";
		}
	}
}