The numerous declarations of the $LastName variable have already been mentioned to you. After resolving the issue that you are overwriting that variable in your while $sth->fetch_array() routine, I look to where the $LastName variable is reposted to the page within a form so that the next call to your cgi script will have a param with the name LastName but I cannot see one.

The problem is that you do not repost a form from which your cgi script can collect the LastName param. If the search form is written from

print header(), start_html;
my $page = "E:/companyname/website/htdocs/resources/header_1.htm";
open (PAGE, "$page") || die "Couldn't open $page";
while (<PAGE>) {print;}
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then the search will submit an empty paramater. Outside of this there is nowhere that the page you write has a form which includes a $LastName param

I would not suggest adding the param to the links as the search should be properly submitted via POST through a form.

You should also validate your incoming paramaters using the untainting idiom

my $LastName=param('LastName');
# pattern should match sql field requirement 
if($LastName =~ /^([\w\s]+)$/){
  $LastName = $1;
}else{
 print invalid search request .html
}

my $reqpage= param('reqpage');

if($reqpage =~ /^(\d+)$/){
  $reqpage = $1;
}else{
 print invalid page request .html
}
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relying on sticky param here will not (afaik) work as you are not creating a cgi object, only using the class methods. Also with concurrent search requests a sticky param may get confused.

Supply a form where the $LastName paramater is given, for your script to be delivered the param it is expecting.