Using Quote In Bad Character Validation String

I've got the following form validation script. How can I include the quote marks as
a bad character?

I tried:
var bad_email_chars="/!#$%&*+^ ()_-=|~`?;:,'"""
It didn't help.

if(form1.elements(i).name=="text_website")
{
var bad_email_chars="/!#$%&*+^ ()_-=|~`?;:,'"
var h,j
for(h=0;h<bad_email_chars.length;h++)
{
for(j=0;j<input_str.length;j++)
{
if(bad_email_chars.charAt(h)==input_str.charAt(j))
{
alert("you have atleast one bad character in you website address. You may not submit this form until you correct this.")
window.event.returnValue=false
form1.elements(i).focus();
}}}}

Also, How do I format with indentations and as non wraping text the messages I send to this forum?