var browser = navigator.appName.substring(0,8);
var version = parseInt(navigator.appVersion);

function makeArray(n)
{
        this.length = n;
        for(var i = 1; i <= n; i++)
        {
                this[i] = new  Image();
        }
        return this;
}
	
     	var normal = new makeArray(4);
     	var hilite = new makeArray(4);
        
		normal[1].src = 'images/home_schedule_b.gif';
		normal[2].src = 'images/home_work_b.gif';
		normal[3].src = 'images/home_resource_b.gif';
		normal[4].src = 'images/home_thesis_b.gif';
		
		hilite[1].src = 'images/home_schedule_b_over.gif';
		hilite[2].src = 'images/home_work_b_over.gif';
		hilite[3].src = 'images/home_resource_b_over.gif';
		hilite[4].src = 'images/home_thesis_b_over.gif';


function onImage(num, name)
{
	if ((browser=="Netscape")&&(version==4))
	{
		//do nothing
	}
	else
	{
		obj = eval("document." + name);
		obj.src = hilite[num].src;
	}
}

function offImage(num, name)
{
	if ((browser=="Netscape")&&(version==4))
	{
		//do nothing
	}
	else
	{
		obj = eval("document." + name);
		obj.src = normal[num].src; 
	}
}