var HEAD_DUR=2;
var BODY_DUR=1.5;

function init(){
fadeIn('head',HEAD_DUR);
}
function sC(){
var i='body_commercials_contact';
if($(i).title=='')return false;
$(i).title='';
fadeIn(i,BODY_DUR);
return false;
}
function s(a){
this.ca=a;
if(!a||this.locked||this.sel==a)return false;
this.locked=true;
if(this.sel){
  //$('a_'+this.sel).className='';
  fadeOut('body_'+this.sel,BODY_DUR);
}
fadeIn('body_'+a,BODY_DUR);
this.sel=a;
//$('a_'+a).className='selected';
setTimeout('this.locked=false;c();',BODY_DUR*1000 + 50);
return false;
}
function c(){s(this.ca);this.ca=null;}
function fadeIn(id,dur){$(id).title='';f(id,dur,0.0,1.0);}
function fadeOut(id,dur){f(id,dur,1.0,0.0);setTimeout('$("'+id+'").title="i"',BODY_DUR*1000+50);}
function f(id,dur,x,y){
new Effect.Opacity(id,{duration:dur,from:x,to:y});
}