Javascript passing parameters into function

Question

Hey, i cant seem to get this to work, im a little confused on how im supposed to pass the colour paramaters:

function colourGreen(red, green, blue)
 {
 document.getElementById("button1").style.backgroundColor = 'rgb(red,green,blue)';
 }

............. .............

<input type="button" id = "button2" value="Price up" onclick = 'colourGreen(0,255,0)'>

Answer 1

I'm guessing this should do the trick

function colourGreen(red, green, blue)
 {
 document.getElementById("button1").style.backgroundColor = 'rgb('+red+','+green+','+blue')';
 }

Answer 2

...'rgb('+red+','+green+','+blue+')';

Answer 3

.style.backgroundColor = 'rgb(' + red +', ' + green + ', ' + blue ')';