function setupNav(current, currentSub){
	if(document.getElementById('Header')){
		var navImages = document.getElementById('Header').getElementsByTagName('img');
		for(i=0;i<navImages.length;i++){
			var img = navImages[i];
			if(img.name != "logo" && img.name != current){
				img.onmouseover = function(){ this.src = "img/"+this.name+"_ov.gif"; };
				img.onmouseout = function(){ this.src = "img/"+this.name+".gif"; };
			}
		}
	}
	if(document.getElementById('Subnav')){
		var subnavImages = document.getElementById('Subnav').getElementsByTagName('img');
		for(i=0;i<subnavImages.length;i++){
			var img = subnavImages[i];
			if(img.name != "logo" && img.name != currentSub){
				img.onmouseover = function(){ this.src = "img/"+this.name+"_ov.jpg"; };
				img.onmouseout = function(){ this.src = "img/"+this.name+".jpg"; };
			}
		}
	}
}