Highlighting Function

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Siopses

Much thanks, Reno; I just got one more question, what are the a1,a2,a3,a4,a5,a6 for? Just wondering. Also, If this
is my code

Graphics 800,600
;Images
COE=LoadImage("cube_of_evil.bmp")
hand=LoadImage("hand.bmp")
title=LoadImage("title.bmp")
Xbound=LoadImage("X-boundary")
Ybound=LoadImage("Y-boundary")
mouse=LoadImage("mouse.bmp")
new0=LoadImage("newgame.bmp")
Global neww=LoadImage("newgame1.bmp")
;Fonts
fntArial=LoadFont("Arial",48,False,True,False)
fntbroadway=LoadFont("Broadway",36,False,False,False)
fntgameover=LoadFont("Chiller",48,True,True,False)
While Not KeyDown(1)
SetFont fntArial
Color 0,0,255
.menu
SetFont fntbroadway
Cls 
DrawImage title,200,0
DrawImage new0,300,250,0
DrawImage mouse,MouseX(),MouseY()
Text 300,300,"High Score",False,False
Text 300,350,"Options",False,False
HighlightNew(mouse,MouseX(),MouseY(),300,250,205,31)
Delay 25
Flip 
Wend 
Function HighlightNew(a1%,a2%,a3%,a4%,a5%,a6%,a7%)
    If ImageRectOverlap(a1,a2,a3,a4,a5,a6,a7)
        DrawImage neww,300,250,0
    EndIf
End Function

Then lets say I want to have the program loop me to the part the mouse is on (for example, new game) when the
collision's detected and MouseDown then how would I do
that with a While/Wend loop?