You can obfuscate (sp?), by inserting text and replacing characters.
eg:
joemamma@myhouse.com
becomes
joemamma no spam at myhouse dot com
however this means you can't click the link. You have to intuit the actual address.
I use a combination of javascript and php that is more functional. This script will display an email link that cannot be harvested. The first argument is the address, the second is optional and is the displayed text.
eg: contact("joemamma@myhouse.com", "Joe Mamma");
function contact($email, $display="hot_tuna")
{
if( $display == "hot_tuna" )
{
$display = "
display1 = \"" . substr($email, 0, 3) . "\"
display2 = \"" . substr($email, 3) . "\"
document.write(display1 + display2);
";
}
else $display = "document.write(\"$display\");";
$domain = strstr($email, "@");
$name = substr($email, 0, strpos($email, "@") );
$out_put = "
<script language=\"Javascript\">
<!--
emailname = \"$name\"
emailserver = \"$domain\"
document.write(\"<a href='mailto:\" + emailname + emailserver + \"'>\");
$display
document.write(\"</a>\");
//-->
</script>
";
return $out_put;
}