// Turns the vowel characters into random cases.
String.prototype.RandomCase = function(){
	return(
		this.replace( 
			new RegExp("([aeiou]{1})", "gi"),  
			// Here, we are passing in a nameless function as the parameter for 
			// the "replace" argument of the String Replace method. It uses the $1 
			// to refer to the grouping of vowels found in the regular expression.
			function($1){ 
				// Get a random number.
				if (Math.random() > .5){
					// Lowercase this one.
					return( $1.toLowerCase() );
				} else {
					// Uppercase this one.
					return( $1.toUpperCase() );
				}
			}
		)
	);
}
 
// Create a test string with plenty of vowels.
var strTest = "Ben Nadel is a Pretty Nice Guy. I really like Kinky Solutions and his Coding Style.";
 
// Alert the random-cased string.
alert( strTest.RandomCase() );