var selectedDiv=0
var totalDivs=0
var partscollect = new Array()
var alltags = new Array()

function contractall(){

var inc=0

while (partscollect[inc]){
  partscollect[inc].style.display="none"
  inc++
  }
}

function show(){

var selectedDivObj=partscollect[selectedDiv]

contractall()
selectedDivObj.style.display="block"
selectedDiv=(selectedDiv<totalDivs-1)? selectedDiv+1 : 0

}

function getdiv(which){

  selectedDiv=which
  show()
}

function start(){

document.getElementById("controldiv").style.display="block"
partscollect=getElementsByClass("popup")
totalDivs=partscollect.length
show()
getdiv(0)
}