Just a note on searching DOM from a point to nearest tag of given type.
To be used in panels of radio plus text box; etc.

In mystudents.php the fns getTagUp() getTagDown() show iteration upwards,
downwards, and sideways.  They may be taken as models?

Needs thought about which direction to go first in various applications of
this.  Panel applic. may want sideways to take priority (getTagDown does down
first, sibs second).  And it will need to combine going up and sideways (and
down again).

I.e. start with self. Go up one. (call with self.parent?)
Do sibs first, then down. i.e. loop over sibs checking; then again with
recursion.

*Need to change the match test code to do: 
	Have non-null ptr; and field nodeName
	Match either $tag to nodeName
	OR .nodeName == 'INPUT'  &&   .type == $tag [e.g. submit, text, ...]

Will need a 3rd function to 'nearest'.
It should search first sibs, then down, then up.
i.e. foreach up
	foreach down
		foreach sib