var list_down1 = [
'starting.htm',
'avput.htm',
'avsave.htm',
'avplot.htm',
'avimage.htm',
'avsurface.htm',
'avpath.htm'
];
var list_across0 = [
'_contents.htm',
'_reference.htm',
'_index.htm',
'_search.htm'
];
function choose_down1(item)
{	var index          = item.selectedIndex;
	item.selectedIndex = 0;
	if(index > 0)
		document.location = list_down1[index-1];
}
function choose_down0(item)
{	var index          = item.selectedIndex;
	item.selectedIndex = 0;
	if(index > 0)
		document.location = list_down0[index-1];
}
function choose_across0(item)
{	var index          = item.selectedIndex;
	item.selectedIndex = 0;
	if(index > 0)
		document.location = list_across0[index-1];
}