function selectMenu(btn, act){
	for(i=1; i<=4; i++){
		menu_btn = eval('menu_'+i)
		dif = menu_btn.src.substring(menu_btn.src.lastIndexOf('/')+7, menu_btn.src.lastIndexOf('/')+8);
		if(dif == 'c'){
			menu_btn.src = 'imagens/menu_'+i+'c.gif';
		}
		else{
			menu_btn.src = 'imagens/menu_'+i+'a.gif';
		}
		
	}
	menu_btn = eval(btn);
	dif = menu_btn.src.substring(menu_btn.src.lastIndexOf('/')+7, menu_btn.src.lastIndexOf('/')+8);
	if(dif != 'c'){
		menu_btn.src = 'imagens/'+btn+act+'.gif';
	}
}
function clickMenu(btn){
	menu_1.src = 'imagens/menu_1a.gif';
	menu_2.src = 'imagens/menu_2a.gif';
	menu_3.src = 'imagens/menu_3a.gif';
	menu_4.src = 'imagens/menu_4a.gif';
	menu_btn = eval(btn);
	menu_btn.src = 'imagens/'+btn+'c.gif';
}

function AbreJanela(URL, width, height, top, left, scroll){
	ArgValues = new Array();
	if(document.all)
		window.showModalDialog(URL,ArgValues,'dialogHeight: '+height+'px; dialogWidth: '+width+'px; dialogTop: '+top+'px; dialogLeft: '+left+'px; edge: Raised; scroll: '+scroll+'; unadorned: Yes; center: No; help: No; resizable: No; status: No;');
	else 
		janGraph = window.open(URL, 'janela_popup', 'width='+width+', height='+height+', left='+left+', top='+top+', scrollbars='+scroll+', resizable=1');
}