help with a for loop please!

[rogueblade]

Hey guys, kinda a nooby question with a for loop....
I have 4 objects that I all want to have their own velocities.

I have a bunch of variables (each one has a different value):

public var vx1:Number;
public var vx2:Number;
public var vx3:Number;
public var vx4:Number; 

Rather than having a function for each object to say:

function1 { this.x = vx1}
function2 { this.x = vx2}
function3 { this.x = vx3}
function4 { this.x = vx4} 

I'd like to have a for loop to have my objects x position to += vx(1 through 4):

for (var i:Number=0; i<5; i++) 
    {
        this.x += (vx+[i]);
        } 

So I tried the above with a combination of " " around different parts of (vx+[i]) but I realized that turning any of it into a string means 'this.x' cannot read it because x has to be a number not a string.

So how can I make this.x = vx1 then vx2 and so on with a for loop?

Thanks