function validate_form() {
 
  txt = document.form.search.value;
  if (txt.indexOf(".") != -1){
        alert("Search is invalid! Contains a '.'"); return;}
  if (txt.indexOf(",") != -1){
        alert("Search is invalid! Contains a ','"); return;}
  if (txt.indexOf("@") != -1){
        alert("Search is invalid! Contains a '@''"); return;}
  if (txt.indexOf("!") != -1){
        alert("Search is invalid! Contains a '!''"); return;}
  if (txt.indexOf("#") != -1){
        alert("Search is invalid! Contains a '#''"); return;}
  if (txt.indexOf("$") != -1){
        alert("Search is invalid! Contains a '$''"); return;}
  if (txt.indexOf("%") != -1){
        alert("Search is invalid! Contains a '%''"); return;}
  if (txt.indexOf("^") != -1){
        alert("Search is invalid! Contains a '^''"); return;}
  if (txt.indexOf("&") != -1){
        alert("Search is invalid! Contains a '&''"); return;}
  if (txt.indexOf("*") != -1){
        alert("Search is invalid! Contains a '*''"); return;}
  if (txt.indexOf("(") != -1){
        alert("Search is invalid! Contains a '(''"); return;}
  if (txt.indexOf(")") != -1){
        alert("Search is invalid! Contains a ')''"); return;}
  if (txt.indexOf("[") != -1){
        alert("Search is invalid! Contains a '[''"); return;}
  if (txt.indexOf("]") != -1){
        alert("Search is invalid! Contains a ']''"); return;}
  if (txt.indexOf(";") != -1){
        alert("Search is invalid! Contains a ';''"); return;}
  if (txt.indexOf(":") != -1){
        alert("Search is invalid! Contains a ':''"); return;}
  if (txt.indexOf("<") != -1){
        alert("Search is invalid! Contains a '<''"); return;}
  if (txt.indexOf(">") != -1){
        alert("Search is invalid! Contains a '>''"); return;}
  if (txt.indexOf("?") != -1){
        alert("Search is invalid! Contains a '?''"); return;}
  if (txt.indexOf("-") != -1){
        alert("Search is invalid! Contains a '-''"); return;}
  if (txt.indexOf("=") != -1){
        alert("Search is invalid! Contains a '=''"); return;}
  if (txt.indexOf("+") != -1){
        alert("Search is invalid! Contains a '+''"); return;}
  else {
        jsi = new makeLinks(linksize);
        searchLinks(jsi, txt);
document.write("<br><hr><br>");
document.write("<a href='Search.htm'>Back</a><br>");

}

}