index error:list index out of range

Could somebody help me out and tell me what did I do wrong that I getting this error message "IndexError: list index out of range"

#!/usr/bin/python

#################################################################################################### #############

# THIS PYTHON PROGRAM SENDS THE EXPANDED USER QUERY TO YAHOO SEARCH
# IT SAVES THE 5 CONSECUTIVE WEB PAGES OF SEARCH RESULTS GIVEN BY YAHOO
# IT SAVES THE 100 PAGES OF THE CORRESPONDING LINK OF THE SEARCH RESULTS

#################################################################################################### #############

import cgi, cgitb, os, sys, string, time, urllib
cgitb.enable()

list_yahoo_search_results=[]

def save_pages():
# SETTING THE PROXIES

proxies={'http':'http://192.168.36.204:8080/'}
opener = urllib.FancyURLopener(proxies);

# SAVING ALL RESULT FILES TO THE SERVER FOR FURTHER PROCESSING (INDEXING AND RANKING) WHICH ARE IN THE LIST FROM ABOVE

for index1 in range(100):

# REMOVING "/" FROM END OF THE URL

h=list_yahoo_search_results[index1]
o=len(h)
o=o-1
if h[o]=='/':
h=h[:-1]
list_yahoo_search_results[index1]=h

index_string=str(index1)

# OPENING FILES TO SAVE THE YAHOO RESULTS PAGES

result_name='result_yahoo'+index_string+'.html'
file_wr=open(result_name,'w')

make_url='http://'+list_yahoo_search_results[index1] #ADD http:// FOR MAKING IT COMPLETE URL
page=opener.open(make_url)
while 1:
line=page.readline()
if not line: break
file_wr.write(line)
file_wr.close()


# FUNCTION FOR GETTING THE RESULTS FROM YAHOO SEARCH ENGINE CREATE LIST OF LINKS

def get_searchresult_yahoo():

# LOOP FOR GETTING THE RESULTS GIVEN BY THE YAHOO SEARCH ENGINE FOR THE EXPANDED USER QUERY WITH INTERESTS

for index in [1,21,41,61,81]:
res_name='res_yahoo'+str(index)+'.html'
res_open=open(res_name,'r')
temp1=1
temp2=-2
while 1:
line=res_open.readline()
if not line:break
else:
if temp1==1:
s=line.find('TOP 20')
k=line.find('WEB RESULTS')
if s != (-1):
temp1=0
if k != (-1):
temp1=0
if temp1==0:
temp2=line.find('<em>')
if temp2==0:
f=line[4:]
f=f[:-6]
list_yahoo_search_results.append(f)

if temp2 > 2:
f=line[(temp2+4):]
f=f[:-6]
list_yahoo_search_results.append(f)
save_pages()

# FUNCTION FOR GENERATING THE PERSONALIZED WEB PAGE WITH TOP 20 RESULTS

def new_personalizedsearchresult_page(user_query):

display=open('Personalized.html','r')
print "Content-type: text/html\n"
for index in range(24):
line=display.readline()
print line

print "<input type='text' name='text1' value=' '>"
print """</td>
<td align='left'><input type='submit' name='send' value='Web Search'></input></td>
</tr>"""
print """<tr></tr> <tr></tr>
<tr>

<td width='40%' align='right' >
<font size='+1' color='#000080'>
You can edit your profile for personalized search
</font>
</td>
<td align='left'>
<a href='profile.html'>Edit Profile</a>
</td>
</tr>
</table>
<br><br><br><b>TOP 20 RESULTS FOR """

print '<b><font color="red">&nbsp "'+user_query.upper() + '"</font><br><hr>'

for index in range(20):
print str(index+1)+". &nbsp&nbsp&nbsp " + "<a href='http://" + list_yahoo_search_results[index] +"'> "+list_yahoo_search_results[index]+"</a><br><br>"

print """<hr><table width='100%'>
<tr>
<td align='center'><font color='red'>Copyright: Vikas Anand</td>
</tr>
</body>
</html>"""


# FUNCTION FOR GETTING THE YAHOO SEARCH ENGINE RESULTS FOR 5 SUCCESSIVE PAGES

def send_query_to_yahoo(user_query):

# MAKING QUERY IN USABLE FORM

if user_query[0]=='+':
user_query=user_query[1:]

# SETTING THE PROXIES

proxies={'http':'http://192.168.36.204:8080/'}
opener = urllib.FancyURLopener(proxies);

# LOOP FOR SAVING 5 SUCCESSIVE YAHOO SEARCH RESULTS PAGES

for index in [1,21,41,61,81]:

index_string=str(index)
url='http://search.yahoo.com/search?ei=UTF-8&p='+ user_query + '&pstart=1&fr=sfp&b=' +index_string

page=opener.open(url)
file_name='res_yahoo'+index_string+'.html'
file_write=open(file_name,'w')

while 1:
line=page.readline()
if not line: break
file_write.write(line)
file_write.close()

get_searchresult_yahoo() # CALL FUNCTION TO SAVE THE RESULT PAGES

new_personalizedsearchresult_page(user_query) # CALL FUNCTION FOR OUTPUT


# FUNCTION FOR ADDING THE USER INTERESTS TO THE USER QUERY

def add_interest_to_query(user_query):

interest_file="interest"

# MAKING USER QUERY PRESENTABLE FOR SENDING IT TO YAHOO SEARCH ENGINE

str=user_query.split(" ")
s=""
for i in str:
s=s+'+'+i
s=s[1:]
user_query=s

# CHECKING THE EXISTENCE OF THE USER INTERESTS' FILE (IF IT EXISTS THEN ADDING THE INTERESTS TO USER QUERY ELSE SENDING USER QUERY ONLY)

if(os.path.isfile(interest_file)): # if user interest file exists
interest = open(interest_file, 'r')
user_interest = interest.readline()
user_query_expanded = user_query + "+" + user_interest
send_query_to_yahoo(user_query_expanded)

else: # if user interest file does not exists
send_query_to_yahoo(user_query)

# FUNCTION TO BE CALLED IF NO QUERY HAS BEEN GIVEN

def error_function():
print """Content-type: text/html\n
<h3>You have not given any Query</h3> """


if __name__ == '__main__':
sys.stderr = sys.stdout
form = cgi.FieldStorage()
for item in sys.argv:
print item

user_query=form.getfirst("user_query",sys.argv[1]).upper()
if user_query == " ":
error_function()
else:
add_interest_to_query(user_query)

You will need to repost this message using code tags (please read the sticky msgs at the top of the forum.

Post the full error message - it should have a complete trace and tell you exactly what line of the code caused the problem.

grim