function dispChange(id) {
  if(id.style.display=="none"){
    id.style.display="block";	
  }
  else{
   id.style.display="none";
  }	
 }
//-->
function w_openc(){
window.open("chemical.html","windowopen1","toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=0,resizable=0,width=950,height=500")}
function w_open1(){
window.open("topics01.html","windowopen2","toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=0,resizable=0,width=450,height=855")}
function w_open2(){
window.open("topics02.html","windowopen3","toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=0,resizable=0,width=600,height=850")}
function w_open3(){
window.open("topics03.html","windowopen4","toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=0,resizable=0,width=830,height=590")}
function w_open4(){
window.open("topics04.html","windowopen5","toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=0,resizable=0,width=600,height=770")}
function w_open5(){
window.open("topics05.html","windowopen6","toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=0,resizable=0,width=542,height=761")}