Template element handler: Get element definition from Tpl->elements and write element value from Tpl->values into template.

Note: This function comes in form print_*() where "*" is usually TAGNAME which can be used in <?elements ?> section of template.

Parameters

string	$id	name of template tag {ID}
string	$sub	modificator (second part) of template tag name {ID.sub}
mixed	$value	value of element going from Tpl->values array