Alternatively, doing this might sort it (ie. poll MouseHit just the once)...
If MouseHit (1) If ImagesCollide (cross,MouseX(),MouseY(),0,lemm1,l1x,l1y,0) Then l1x=10000 If ImagesCollide (cross,MouseX(),MouseY(),0,lemm2,l2x,l2y,0) Then l2x=10000 If ImagesCollide (cross,MouseX(),MouseY(),0,lemm3,l3x,l3y,0) Then l3x=10000 If ImagesCollide (cross,MouseX(),MouseY(),0,lemm4,l4x,l4y,0) Then l4x=10000 EndIf