Thx so much, Chris

"could" is a modal with multiple meanings. Here, "could you" and "would you" are conditionals for politeness. More information here: http://www.bbc.co.uk/worldservice/learningenglish/grammar/learnit/learnitv239.shtml

Thx so much :)Gdanning.. Is that 'Could you 'is past tense seems to make sense? Can you. Could you, Would you..all the same..

In spojen English, all mean the same thing (ie, asking someone to do sonething), but technically "can you" means "are you able to" and "could you" is past tense so technically makes do sense. But it is probably the most commonly used in spoken English, in the USA.