function show_hide(sul){
if(sul=='p' || sul=='l' || sul=='exp'){
if(sul=='p'){
var cpt=0;
}
else if(sul=='exp'){
var cpt=-6;
}
else{
var cpt=1;
}
for(var i=2;i<5;i++){
sul2=sul+i;
var fubar = document.getElementsByTagName('tr');
for(var j=0; j<fubar.length; j++){
if (fubar[j].attributes.getNamedItem('class') && fubar[j].attributes.getNamedItem('class').value==sul2 && fubar[j].style.display!='table-row'  && fubar[j].style.display!='block'){
var getEle = fubar[j];
if(document.selection){
swicth(getEle, 'block');
}
else{
swicth(getEle, 'table-row');
}
if (cpt==1){
if (i==4){
fubar[j+1].style.display='none';
}
return false;
}
else{
cpt++;
}
}
}
}
}
else{
var getEle = document.getElementById(sul);
swicth(getEle, 'block');
}
}
function swicth(getEle, lestyle){
if (getEle.style.display==lestyle)
{
        getEle.style.display='none';
}
else
{
        getEle.style.display=lestyle;
}
}