var last_sel = 0;
var tab_alias = 'tab';
var menu_alias = 'menu';

function menuSelect(sel_index)
{
	resetAll();
   	if(!sel_index)sel_index = 1;
	document.getElementById(tab_alias + '_' + sel_index).className = tab_sel;
	document.getElementById(menu_alias + '_' + sel_index).style['display'] = '';
	last_sel = sel_index;
}//menuSelect                   

function resetAll()
{             
	for(var m = 1; m <= menu_itens; m++)
	{
   		document.getElementById(menu_alias + '_' + m).style['display'] = 'none';     
   		document.getElementById(tab_alias + '_' + m).className = tab_normal;
   }//for m	
}//hideAll

function selectNext()
{
	if(last_sel < menu_itens)last_sel++;
		else last_sel = 1;
	menuSelect(last_sel);
}//selectNext

function selectPrev()
{
	if(last_sel > 1)last_sel--;
		else last_sel = menu_itens;
	menuSelect(last_sel);
}//selectNext

function startMenu() 
{		
	for(var m = 1; m <= menu_itens; m++)
	{
		var tab = document.getElementById(tab_alias + '_' + m);
		tab.onmouseover = function() 
		{
			if(this.className != tab_sel)this.className = tab_hover;
		}
		tab.onmouseout = function() 
		{
			if(this.className != tab_sel)this.className = tab_normal;
		}		
	}//for m
}//startMenu