var segundos = 1;

function back_ad(div){
        
        clearInterval(int_ad);
        i = bcont;
        if(document.getElementById(div+i).style.display == "block"){
                document.getElementById(div+i).style.display = "none";
                
                if(i > 1){
                        bcont--;
                        document.getElementById(div+bcont).style.display="block";
                }else{
                        document.getElementById(div+bfim).style.display="block"; 
                        bcont = bfim;
                }
        }
        
        if (controla == 0)
        {
                //div = "multi";
                int_ad = setInterval("troca_ad(div,bcont++,bfim)", segundos * 2000);
        }
}

function next_ad(div){
        
        clearInterval(int_ad);
        i = bcont;
        if(document.getElementById(div+i).style.display == "block"){
                document.getElementById(div+i).style.display = "none";
                
                if(i < bfim){
                        bcont++;
                        document.getElementById(div+bcont).style.display="block";
                }else{
                        document.getElementById(div+1).style.display="block"; 
                        bcont = 1;
                }
        }
        
        if (controla == 0)
        {
                //div = "multi";
                int_ad = setInterval("troca_ad(div,bcont++,bfim)", segundos * 2000);
        }
}

function troca_ad(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{
						bcont = 1;
						t = bcont;
                        document.getElementById(div+t).style.display="block";
                }
        } 
}

var controla = 0;
function playstop_ad(div){
	if(controla == 0){
		clearInterval(int_ad);
//                document.getElementById("playpau").src="imgs/mpla.gif";
                document.getElementById("playpau").alt="Play";
		controla = 1;
	}else{
                controla = 0;
                //div = "multi";
		int_ad = setInterval("troca_ad(div,bcont++,bfim)", segundos * 2000);
//                document.getElementById("playpau").src="imgs/mpau.gif";
                document.getElementById("playpau").alt="Pausa";
    	}
}