URGENT HELP NEEDED – “phpMyAdmin – Error #1040 – Too many connections”

Oh dear! Tomorrow I’m due to reveal the site that I have designed for my employer but it has suddenly crashed. I came to a colleague’s house to make some final edits on it and half way through saving a page an error sign appeared and the browser shut down. On re-opening I get this message: “Error establishing a database connection”. Now, upon trying to login to the phpMyAdmin (in order to reset the database to previous version or something? will this work..?) I get this message: “phpMyAdmin – Error #1040 – Too many connections” What can I do? Any assistance will be met with endless gratitude as this is a total nightmare!