win xp with hp laserjet 5 and internet printing

hello everyone,

i have a network of 15 computers. 6 of them are xp pro
boxes, 5 of them are xp home boxes, 2 of them are w98
boxes (will be replaced)and 2 of them are win2k boxes.

3 of the xp pro boxes are constantly printing to a lexmark
laserjet 5 printer. this printer is connected to one of
those 3 xp pro boxes via parallel port and shared amongst
12 of the computers.

the 3 win xp pro boxes can connect to the printer fine,
and applications print fine. however when they print from
hotmail, or other internet based email, it prints either
blank pages or just the internet advertisements. also,
when these boxes print, there is a lag time in which the
print box gets "stuck" on the screen before the document
prints.

how can i get these machines to print "correctly"? is
there anything i can reset or drivers that i can download,
or if anyone knows of any work around for it?

i do plan to get a print server eventually. also, i had
the printer connected to a win98 box and only win98 boxes
were printing to this printer, and there was no problem.
this problem only started to appear after i hooked up the
laserjet 5 to the xp pro box.

any help is much appreciated.
thanks!
MAC