[OpenLayers-Users] Bounds

[eoinyp]

Hi all,
Could someone please explain how to define the bounds of a map?

I want to centre my map on Ireland when it initialises, but I am having
trouble with the bounds arguments.
As I understand it, the maxExtent of the globe is (-180,-90,180,90) 
A box around Ireland using the same coordinate system is (-13.5, 51.5, -4.5,
55.5)
So shouldnt I be defining my map as: 
maxExtent: new OpenLayers.Bounds(-13.5,51.5,-4.5,55.5 ) 
?
This doesnt work, unsurprisingly.
I found somewhere else the bounds of the world defined as:
maxExtent: new OpenLayers.Bounds(-20037508, -20037508,20037508, 20037508.34)
which works great, but it shows the entire globe, as I said, I want to focus
on Ireland.
What coordinate system is this? and how do I translate the area I want to
map to this coordinate system?

The variable maxResolution also seems to vary from map to map, I am not sure
what this should be set to.
The documentation doesnt give any idea of the range of appropriate values.
Thanks,

Eoinyp. 

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