Looking for string hashing using a portable but secure method

[eluser]Dam1an[/eluser]
Here's a random idea off the top of my head... no idea how practical ad secure it would be though...
(Note: using plain old md5 and salt for simplicity sake)

Instead of hashing the password and salting it, and then storing it in a 32 char field in your database, make the field 32*X where x is a multiplier
Then do md5(md5(password).salt1) . md5(md5(result of first part).salt2) . md5(md5(result of third part).salt1)

so you hash then salt, then concatenate the hashed and salted result of that with its result etc