This helps a lot, however I'm not quite there; I think there may be something else to do so that I can select the specific choice within the "Enquiry" section of my form. I have attached a screen shot of my form code for reference to what I am talking about.. the arrows on it are pointing to my field choices and I need to link them individually to be auto-loaded when the contact page loads from a link; I want to add a specific choice to the end of the document, something like http://example.com/document.htm?focusOn=Enquiry?"Laptop Repair" but I'm not sure the exact code. The code you told me to add to the document page works, but I can only get it working for the text fields, not the drop-down menus.
Any further help would be appreciated.