function initKLayers(){
  isDOM=document.getElementById?true:false
  isOpera=isOpera5=window.opera && isDOM
  isOpera6=isOpera && window.print
  isOpera7=isOpera && document.readyState
  isMSIE=isIE=document.all && document.all.item && !isOpera
  isStrict=document.compatMode=='CSS1Compat'
  isNN=isNC=navigator.appName=="Netscape"
  isNN4=isNC4=isNN && !isDOM
  isMozilla=isNN6=isNN && isDOM

  if(!isDOM && !isNC && !isMSIE && !isOpera){
    KLayers=false
    return false
  }

  pageLeft=0
  pageTop=0

  KL_imgCount=0
  KL_imgArray=new Array()

  KL_imageRef="document.images[\""
  KL_imagePostfix="\"]"
  KL_styleSwitch=".style"
  KL_layerPostfix="\"]"

  if(isNN4){
    KL_layerRef="document.layers[\""
    KL_styleSwitch=""
  }

  if(isMSIE){
    KL_layerRef="document.all[\""
  }

  if(isDOM){
    KL_layerRef="document.getElementById(\""
    KL_layerPostfix="\")"
  }

  KLayers=true
  return true
}

initKLayers()

// document and window functions:

function KL_getBody(w){
  if(!w) w=window
  if(isStrict){
    return w.document.documentElement
  }else{
    return w.document.body
  }
}

function getWindowLeft(w){
  if(!w) w=window
  if(isMSIE || isOpera7) return w.screenLeft
  if(isNN || isOpera) return w.screenX
}

function getWindowTop(w){
  if(!w) w=window
  if(isMSIE || isOpera7) return w.screenTop
  if(isNN || isOpera) return w.screenY
}

function getWindowWidth(w){
  if(!w) w=window
  if(isMSIE) return KL_getBody(w).clientWidth
  if(isNN || isOpera) return w.innerWidth
}

function getWindowHeight(w){
  if(!w) w=window
  if(isMSIE) return KL_getBody(w).clientHeight
  if(isNN || isOpera) return w.innerHeight
}

function getDocumentWidth(w){
  if(!w) w=window
  if(isMSIE || isOpera7) return KL_getBody(w).scrollWidth
  if(isNN) return w.document.width
  if(isOpera) return w.document.body.style.pixelWidth
}

function getDocumentHeight(w){
  if(!w) w=window
  if(isMSIE || isOpera7) return KL_getBody(w).scrollHeight
  if(isNN) return w.document.height
  if(isOpera) return w.document.body.style.pixelHeight
}

function getScrollX(w){
  if(!w) w=window
  if(isMSIE || isOpera7) return KL_getBody(w).scrollLeft
  if(isNN || isOpera) return w.pageXOffset
}

function getScrollY(w){
  if(!w) w=window
  if(isMSIE || isOpera7) return KL_getBody(w).scrollTop
  if(isNN || isOpera) return w.pageYOffset
}

function preloadImage(imageFile){
  KL_imgArray[KL_imgCount]=new Image()
  KL_imgArray[KL_imgCount++].src=imageFile
}

var KL_LAYER=0
var KL_IMAGE=1

function KL_findObject(what,where,type){
  var i,j,l,s
  var len=eval(where+".length")
  for(j=0;j<len;j++){
    s=where+"["+j+"].document.layers"
    if(type==KL_LAYER){
      l=s+"[\""+what+"\"]"
    }
    if(type==KL_IMAGE){
      i=where+"["+j+"].document.images"
      l=i+"[\""+what+"\"]"
    }
    if(eval(l)) return l
    l=KL_findObject(what,s,type)
    if(l!="null") return l
  }
  return "null"
}

function KL_getObjectPath(name,parent,type){
  var l=((parent && isNN4)?(parent+"."):(""))+((type==KL_LAYER)?KL_layerRef:KL_imageRef)+name+((type==KL_LAYER)?KL_layerPostfix:KL_imagePostfix)
  if(eval(l))return l
  if(!isNN4){
    return l
  }else{
    return KL_findObject(name,"document.layers",type)
  }
}

function layer(name){
  return new KLayer(name,null)
}

// class "KLayer":

function KLayer(name,parent){
  this.path=KL_getObjectPath(name,parent,KL_LAYER)
  this.object=eval(this.path)
  if(!this.object)return
  this.style=this.css=eval(this.path+KL_styleSwitch)
}

KLP=KLayer.prototype

KLP.isExist=KLP.exists=function(){
  return (this.object)?true:false
}

KLP.setVisibility=function(v){
  this.css.visibility=(v)?(isNN4?"show":"visible"):(isNN4?"hide":"hidden")
}