function showinvestor(f){
 if(f){visi="visible";}
 else{visi="hidden";}
 if(document.layers){document.investor.visibility=visi;}
 if(document.all){document.all.investor.style.visibility=visi;}
 if(document.getElementById){document.getElementById("investor").style.visibility=visi;}
 } 
 
 function showabout(f){
 if(f){visi="visible";}
 else{visi="hidden";}
 if(document.layers){document.about.visibility=visi;}
 if(document.all){document.all.about.style.visibility=visi;}
 if(document.getElementById){document.getElementById("about").style.visibility=visi;}
 }