By naming a window, in this case you've given it the name of 'name', and then later opening into the same named window, you will overwrite the existing window of the same name:
Code:
<a href="images/forsale/foxrun/bigpictures/picture2.html" onClick="NewWindow(this.href,'name','720','530','n');return false">
If however, you use a unique name for each additional window, it will create its own distinct window:
Code:
<a href="images/forsale/foxrun/bigpictures/picture2.html" onClick="NewWindow(this.href,'fred','720','530','n');return false">
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