Variable Instance Names

Use a variable as an instance name.

[MartinWeb]

Hello. I am attempting to use a variable in an instance name.

platforms=1;
while(platforms<3){
platformNum = "platform"+platforms;
platformX=_root.var(platformNum)._width;
}

I attempted the above code, but I am told that a '.' is expected after the operator. If you have any ideas, please help. Thanks.