Webuser Forums: Is there the equivalent of Goto in Javascript?

Hi,

I am a complete beginner ,trying to learn some Javascript. I was asking myself if there is a command , like the Goto command in Basic. I remember:

10 bla bla
20 bla bla
30 if (Something) goto 10

Or if this is more helpful:

var number ;

number = prompt("Please enter a number"," ");

number = parseInt(number)

if (isNaN(number))
{
document.write("This is not a number<br />");
document.write(" Please try again!");

}
else

{
var result ;

result = 2*number ;

document.write("The number times two is = "+result);
}

Just after the

"Please try again",..., I'd like to make it return to the first line, therefore asking the user to add another input,...

Could anybody point me in the right direction of a command which would do this?
Many Thanks

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