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// 
// Funktionen für das Hauptmenu
// Autor: df
//
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// Positionen, Variablen, usw. ermitteln / Werte zuweisen
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function dokument_geladen(){
  for (var i=0; i<=anzahl_menupunkte; i++){
    if (i == 4 || i == 5){
      if (browser_ne){
        layer_syntax[i] = document["untermenu"+i];
        if (i == 4){
          layer_syntax[i].top = '81';
        }
        if (i == 5){
          layer_syntax[i].top = '107';
        }
        sichtbar = 'show';
        unsichtbar = 'hide';
      }
      if (browser_ne6){ 
        layer_syntax[i] = document.getElementById("untermenu"+i).style; 
        if (i == 4){
          layer_syntax[i].top = '81';
        }
        if (i == 5){
          layer_syntax[i].top = '107';
        }
        sichtbar = 'visible';
        unsichtbar = 'hidden'; 
      }
      if (browser_ie){ 
        layer_syntax[i] = document.all["untermenu"+i].style; 
        if (i == 4){
          layer_syntax[i].top = '81';
        }
        if (i == 5){
          layer_syntax[i].top = '107';
        }
        sichtbar = 'visible';
        unsichtbar = 'hidden'; 
      }
    }
    bild_syntax[i] = document.images['lm' + i];
  }  
}


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// Layerfunktionen
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function layerfunktion(layer_index){
  if (layer_index == layer_alt){
    layerzu(layer_index);
  }
  else{
    layerauf(layer_index);
  }
}


function layerzu(){
  var layer_index = layerzu.arguments;
  for (var i=0; i<layer_index.length; i++){  
    if (layer_syntax[layer_index[i]]){
      layer_syntax[layer_index[i]].visibility = unsichtbar;
    }
  }
  layer_alt = 0;
}

function layerauf(layer_index){
  if (layer_syntax[layer_index]){
    layer_syntax[layer_index].visibility = sichtbar;  
    layer_alt = layer_index;
  }
}


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// Mouse-Effekte
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function mausueber(bild_index){
  if (bild_syntax[bild_index]){
    bild_syntax[bild_index].src = pfeil_aktiv.src
  }
}

function mausweg(bild_index){
  altmenuklick = menuklick;
  if (bild_index != altmenuklick){
    if (bild_syntax[bild_index]){
      bild_syntax[bild_index].src = pfeil_inaktiv.src
    }
  }  
}

function mausklick(bild_index){
  altmenuklick = menuklick;
  if (bild_syntax[altmenuklick]){
    bild_syntax[altmenuklick].src = pfeil_inaktiv.src
  }
  if (bild_syntax[bild_index]){
    bild_syntax[bild_index].src = pfeil_aktiv.src
  }
  menuklick = bild_index;
}