function exp(strTag ,strAttribute){ 
var elem = document.getElementsByTagName(strTag); 
var elem1 =window.event.srcElement; 
for (var i=0;i<elem1.children.length;i++){ 
 // elem1.children[i].innerText=="4"?elem1.children[i].innerText="5":elem1.children[i].innerText="4"; 
} 
for (var i =0;i<elem.length;i++) 
{ 
if(elem[i].getAttribute(strAttribute)=="yes") 
{ 
elem[i].style.display=='none'? elem[i].style.display='block':elem[i].style.display='none'; 
} 
} 
}