I asked this in a thread a few days ago. No, one could confirm yay or nay, but in a sample piece of code I saw somewhere else, Macs appeared not to be supported. Pity.
Javascript and JScript are moreless the same thing, the latter merely being MS's version. There isn't an exclusively IE method, they both call window.print.
As for PHP, this is a server side language and is therefore irrelevant here. What you want to do can only be achieved on the client machine and therefore you need a client side scripting language such as JS.
Server side languages serve up pages according to certain values and conditions (for want of a better way of putting it), whereas client side scripts allow you to manipulate the browser itself.
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