var example_inp = new Array(
new Array('x', '2', '3', 'x', 'AUTO'),
new Array('5', '2', '10', '(x + 1)', 'AUTO'),
new Array('1', '2', 'z', '2z', 'AUTO'),
new Array('1.5', '7.3', 'z', '6.9', 'AUTO'));

// decimal, percent

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

function example(){
	leftNumer = document.getElementById('left_numer');
	leftDenom = document.getElementById('left_denom');
	rightNumer = document.getElementById('right_numer');
	rightDenom = document.getElementById('right_denom');
	solvf = document.getElementById('solvf');
	
	leftNumer.value = example_inp[i][0];
	leftDenom.value = example_inp[i][1];
	rightNumer.value = example_inp[i][2];
	rightDenom.value = example_inp[i][3];
	
	var j;
	for (j = 0; j < solvf.options.length; j++){
		if (solvf.options[j].text == example_inp[i][4]){
			solvf.selectedIndex = j;
			break;
		}
	}
	
	i += 1;
	if (i >= example_inp.length)
		i = 0;
}