var example_inp = new Array(new Array('', '1', '2', 'decimal'), new Array('', '7', '8', 'percentage'),
new Array('1', '7', '8', 'improper'), new Array('', '140', '63', 'mixed'), new Array('', '4', '8', 'mixed'));

// decimal, percent

var i = Math.floor(Math.random() * example_inp.length);

function example(){
	var form = document.getElementById('calcForm')
	var whole = document.getElementById('mixed_whole')
	var numer = document.getElementById('mixed_numer')
	var denom = document.getElementById('mixed_denom')
	whole.value = example_inp[i][0];
	numer.value = example_inp[i][1];
	denom.value = example_inp[i][2];

	var cmd = form.outputFormat
	var j;
	for (j = 0; j < cmd.options.length; j++){
		if (cmd.options[j].value == example_inp[i][3]){
			cmd.selectedIndex = j;
			break;
		}
	}
	
	i += 1;
	if (i >= example_inp.length)
		i = 0;
}