Net artists, take note: there's an available opening at this month's Rhizome OpenMouse event on Thursday, July 26 -- co-sponsored by Sound Lab/Cultural Alchemy. It's essentially an "open mic" for those creating art using new media. The festivities take place from 8pm-midnight at FUN, 130 Madison Street between Pike & Market, under the Manhattan Bridge overpass. This month's presenting artists include Azhaday Asiadai, the creator of "Four and Six," a Net art piece that mimics "Lite Brite" imagery and allows you to cram your favorite links onto one page without scrolling forever.