function janela(mypage, myname, w, h, scroll) {
var winl = (screen.width - w) / 2;
var wint = (screen.height - h) / 2;
winprops = 'height='+h+',width='+w+',top='+wint+',left='+winl+',scrollbars='+scroll+',resizable=no,status=no'
win = window.open(mypage, myname, winprops)
if (parseInt(navigator.appVersion) >= 4) { win.window.focus(); }
}
function over(id){
		document.getElementById(id).src 					= '../../img/menu_interna/' + id + '_over.jpg';
		document.getElementById('div_'+id).style.display 	= '';
		document.getElementById('top').style.display 		= '';			
		document.getElementById('bottom').style.display 	= '';				
		document.getElementById('left').style.display 		= '';			
		document.getElementById('right').style.display 		= '';					
	}
function oculta_todos(){
	document.getElementById('div_empresa').style.display = 'none';
	document.getElementById('div_produtos').style.display = 'none';
	document.getElementById('div_parceiros').style.display = 'none';
	document.getElementById('div_sugestoes').style.display = 'none';
	document.getElementById('div_contato').style.display = 'none';
	
	document.getElementById('empresa').src 		= '../../img/menu_interna/empresa.jpg';
	document.getElementById('produtos').src 	= '../../img/menu_interna/produtos.jpg';
	document.getElementById('parceiros').src 	= '../../img/menu_interna/parceiros.jpg';
	document.getElementById('sugestoes').src 	= '../../img/menu_interna/sugestoes.jpg';
	document.getElementById('contato').src 		= '../../img/menu_interna/contato.jpg';
	
	document.getElementById('top').style.display 	= 'none';			
	document.getElementById('bottom').style.display = 'none';		
	document.getElementById('left').style.display 	= 'none';			
	document.getElementById('right').style.display 	= 'none';						
					
}
function limpa_campo(id){
	if(id == "usuario"){
	if(document.getElementById(id).value == 'Usuario'){
		document.getElementById(id).value = '';
	}
	} else{
		document.getElementById(id).value = '';	
	}
}

function restaura_campo(id){
	if(document.getElementById(id).value == ''){
		document.getElementById(id).value = 'Usuario';
	}
}