Find in string

in my javascript, i grab the value of a the drop down menu, the value will look like, "34,myfile.txt"

How can I get every right of the comma? the value could hold anything or be any length, I just need everything right of the comma..

Is it possible in javascript?

Thanks,
Ryan

var myVar = "34,myfile.txt";
var myNewVar = myVar.substring(myVar.indexOf(",",0)+1);
alert(myNewVar);