function  display(str){ 
 
 document.all('link').style.visibility="hidden"
 document.all('link').style.display="none"
 document.all('link1').style.visibility="hidden"
 document.all('link1').style.display="none"
 document.all('link2').style.visibility="hidden"
 document.all('link2').style.display="none"
 document.all('link3').style.visibility="hidden"
 document.all('link3').style.display="none"
 document.all('link4').style.visibility="hidden"
 document.all('link4').style.display="none"
 document.all('link5').style.visibility="hidden"
 document.all('link5').style.display="none"
 document.all('link6').style.visibility="hidden"
 document.all('link6').style.display="none"
 document.all('link7').style.visibility="hidden"
 document.all('link7').style.display="none"
 document.all('link8').style.visibility="hidden"
 document.all('link8').style.display="none"
 document.all('link9').style.visibility="hidden"
 document.all('link9').style.display="none"
 document.all('link10').style.visibility="hidden"
 document.all('link10').style.display="none"
 
 

 document.all(str).style.visibility="visible"
 document.all(str).style.display="block"

}