Heh:
var sides = slade.map.sidedefs;
for (var i = 0; i < sides.length; i++) {
if (sides[i].stringProperty("texturemiddle") != "-")
sides[i].setStringProperty("texturemiddle", "AASHITTY");
if (sides[i].stringProperty("texturetop") != "-")
sides[i].setStringProperty("texturetop", "AASHITTY");
if (sides[i].stringProperty("texturebottom") != "-")
sides[i].setStringProperty("texturebottom", "AASHITTY");
}
var sectors = slade.map.sectors;
for (var i = 0; i < sectors.length; i++) {
sectors[i].setStringProperty("textureceiling", "SLIME09");
sectors[i].setStringProperty("texturefloor", "SLIME09");
}