var segundos = 1;

function backFt(){
        
        clearInterval(intX);
        i = cont;
        if(document.getElementById("multi"+i).style.display == "block"){
                document.getElementById("multi"+i).style.display = "none";
                
                if(i > 1){
                        cont--;
                        document.getElementById("multi"+cont).style.display="block";
                }else{
                        document.getElementById("multi"+fim).style.display="block"; 
                        cont = fim;
                }
        }
        
        if (controla == 0)
        {
                div = "multi";
                intX = setInterval("troca(div,cont++,fim)", segundos * 1000);
        }
}

function nextFt(){
        
        clearInterval(intX);
        i = cont;
        if(document.getElementById("multi"+i).style.display == "block"){
                document.getElementById("multi"+i).style.display = "none";
                
                if(i < fim){
                        cont++;
                        document.getElementById("multi"+cont).style.display="block";
                }else{
                        document.getElementById("multi1").style.display="block"; 
                        cont = 1;
                }
        }
        
        if (controla == 0)
        {
                div = "multi";
                intX = setInterval("troca(div,cont++,fim)", segundos * 1000);
        }
}

function troca(div,i,eofim){
        
        if(document.getElementById(div+i).style.display == "block"){
                document.getElementById(div+i).style.display = "none";
                
                if(i < eofim){
                        aux = eval(1+i);
                        document.getElementById(div+aux).style.display="block";
                }else{
                        
                        if (div == 'multi')
                        {
                                cont = 1;
                                t = cont;
                        }
                        else if (div == 'tempo')
                        {                                
                                tcont = 0;
                                t = tcont;
                        }
                        
                        document.getElementById(div+t).style.display="block";
                }
        } 
}

var controla = 0;
function playstop(){
	if(controla == 0){
		clearInterval(intX);
//                document.getElementById("playpau").src="imgs/mpla.gif";
                document.getElementById("playpau").alt="Play";
		controla = 1;
	}else{
                controla = 0;
                div = "multi";
		intX = setInterval("troca(div,cont++,fim)", segundos * 1000);
//                document.getElementById("playpau").src="imgs/mpau.gif";
                document.getElementById("playpau").alt="Pausa";
    	}
}