function procurar() {
    var str1, length1;
    str1 = document.frm_busca.SearchString.value;
    length1 = str1.length;
    if(length1 < 2) {
	   alert("Por favor, digite mais que 2 caracteres");
	   document.frm_busca.SearchString.focus();
	   return false;
    }else {
     document.frm_busca.dir.value = document.location.pathname;
   return true;
    }
}