var NS4 = (document.layers);
var IE4 = (document.all);
var win = window;    // window to search.
var n   = 0;

function findInPage(str) 
{
    var txt, i, found;
    if (str == "")
      return false;
    
    // Find next occurance of the given string on the page, wrap around to the
    // start of the page if necessary.
    if (NS4)
    {

        // Look for match starting at the current point. If not found, rewind
        // back to the first match.

        if (!win.find(str))
            while(win.find(str, false, true))
            n++; 
        else
            n++;

        // If not found in either direction, give message.
        if (n == 0)
            alert("No encontrado");
    }  // Fin del primer if(NS4)
  
    if (IE4) 
    {
        txt = win.document.body.createTextRange();

        // Find the nth match from the top of the page.
        for (i = 0; i <= n && (found = txt.findText(str)) != false; i++)
        {
            txt.moveStart("character", 1);
            txt.moveEnd("textedit");
        }
  
        // If found, mark it and scroll it into view.  
        if (found) 
        {
            txt.moveStart("character", -1);
            txt.findText(str);
            txt.select();
            txt.scrollIntoView();
            n++;
        }  
        // Otherwise, start over at the top of the page and find first match.
        else 
        {
            if (n > 0) 
            {
                n = 0;
                findInPage(str);
            }
            // Not found anywhere, give message.
           else
              alert("No encontrado");
        }
    }// Fin del primer if(IE4)

    return false;
}