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The method that I use to resize images is as follows:
Below the Pixel Dimension and Document Size Boxes will be two more small boxes titled "Constrain Proportions" and "Resample Image'' which by default have "tick" marks in.
Now the clever bit in Photoshop, click on "File" from the top bar and select 'Save for Web" from the drop down box. After a few seconds, depending on the speed of your computer, a new screen will appear with two boxes (Elements) or up to four boxes (Photoshops 4 upwards) and these will show the original image on the left with an "Optimised" version to the right. In the settings box click on "JPEG medium" and watch how the size of the image file is reduced.
Hope these guidelines are helpful, feedback at the meeting or by email would be appreciated.