Lets says I have X1,Y1,X2,Y2,X3,Y3,X4,Y4
X1,Y1 are the start coordinate and X4,Y4 are then end coordinate
X1 = 100
Y1 = 100
X2 = 200
Y2 = 100
X3 = 200
Y3 = 150
X4 = 300
Y4 = 150
So at the end coordinate that is X4,Y4 it will put an arrow of in the right direction depending of X3,Y3 and X4,Y4 coordinate.
I use IE6 on an intranet so don't need to be compatible with the other browser anyway I use an HTA so.