function makearray(num) {
  this.length=num ;
}
function show(cual){
	nab_vis  = cual;
	cont_vis = cual;
	if (nabs.length != conts.length) {
		if (cual>nabs.length)  nab_vis  = nabs.length;
    if (cual>conts.length) cont_vis = conts.length;
	}
  nabs[nab_vis].visibility  = "visible" ;
  conts[cont_vis].visibility = "visible" ;
}
function hide(){
  for (i=1; i <= nabs.length ; i++)  nabs[i].visibility  = "hidden" ;
  for (i=1; i <= conts.length ; i++) conts[i].visibility = "hidden" ;
}
function init() {			  
  show(1);
}