Quick prompt method question

[double91]

In order to save a little space I would like to change the three current prompt methods into only one, getting all three numbers together.

var a = prompt("What is the first value? \n", " ");
var b = prompt("What is the second value? \n", " ");
var c = prompt("What is the third value? \n", " ");

[Logic Ali]

var vals;

while( ( vals = prompt( "Enter the first, second and third values separated by spaces", " ").replace( /^\s*|\s*$/g, '').split( /\s+/ ) ).length != 3 )
;

alert( vals );