ie=document.all?1:0;
ns=document.layers?1:0;

if (document.all) {
    brow="document.all";
    parA="[\"";
    parB="\"]";
    styleRef=".style.visibility";
    testH="\"hidden\"";
    testS="\"visible\"";
   }
  else if (document.layers){ //NN4
    brow="document.layers";
    parA="[\"";
    parB="\"]";
    styleRef=".visibility";
    testH="\"hide\"";
    testS="\"show\"";
   }
  else if (document.getElementById) { // Opera, NN6 e FF
    brow="document.getElementById";
    parA="(\"";
    parB="\")";
    styleRef=".style.visibility";
    testH="\"hidden\"";
    testS="\"visible\"";
       }
       
 function Hide(lname){
  eval(brow+parA+lname+parB+styleRef+"="+testH+";");
 }
 
 function ShowL1(lname) {
 eval(brow+parA+lname+parB+styleRef+"="+testS+";");
 }
 
 function ShowHide(lnameS,lnameS1,lnameH,lnameH1){
 	if (lnameH!="nul"){
 	Hide(lnameH);
  }
 	if (lnameH1!="a"){
 	Hide(lnameH1)
  }
 	if (lnameS!="nul"){
 	ShowL1(lnameS); 
  }
 	if (lnameS1!="a"){
 	ShowL1(lnameS1)
  }  
 }