var denied=new Array("span","div","textarea","p","br");
function findInPage(string){
str = document.getElementById("maincontent").innerHTML;
re = new RegExp("("+string+")","gi");
var in_array=false
for(x=0;x<denied.length;x++){
  comp=denied[x].substr(0,string.length);
  if(string == comp)in_array=true;
}
if(string.length > 2 && !in_array){
  newstr=str.replace(re, '<span class="highlight">$1</span>');
  document.getElementById("maincontent").innerHTML=newstr;
}
return false;
}