[galaxy-user] selecting reads at random from fastq file

Hi, I am curious if anyone knows how to select random lines from a fastq file. There is a select random lines tool in text manipulation tools, but it does not treat fastq files specifically, so it will not group quality lines with sequence lines. And if I turn the fastq file to tabular form in order to select lines, I can no longer return it to fastq form. Anyone know a way to do this in galaxy? Otherwise, perhaps another program? Thanks. Austin