Displaying selected values after form submission

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I know this should be an easy one, but I'm failing to make it work. I have the following form:\[code\]<form action="" method="post"><input type="checkbox" name="blades[]" value="http://stackoverflow.com/questions/3745359/2" />Blade AM-01 <br /><input type="checkbox" name="blades[]" value="http://stackoverflow.com/questions/3745359/5" />Blade AM-02 <br /><input type="checkbox" name="blades[]" value="http://stackoverflow.com/questions/3745359/10" />Blade KT-24 <br /><input type="checkbox" name="blades[]" value="http://stackoverflow.com/questions/3745359/1" />Blade FR-98 <br /><input type="checkbox" name="blades[]" value="http://stackoverflow.com/questions/3745359/66" />Blade PR-11 <br /></form>\[/code\]After submit I want to display the form again and to check the checkboxes that the user has selected before submission. My language of choice is PHP.Thanks.