var opt = Array();
var dev = Array();
opt[1] = 59;
opt[2] = 119;
opt[3] = 164;
opt[4] = 209;
opt[5] = 249;
opt[6] = 279;
opt[7] = 319;
dev[10] = 9;
dev[15] = 29;
dev[20] = 49;
dev[25] = 74;
dev[30] = 109;
dev[35] = 149;
dev[40] = 189;

function maintain() {
	if (!document.getElementById('main_opt').value) {
		document.getElementById('main_msg').innerHTML = '<span style="color:#ff0000">Please select an optimisation option</span>';
	} else if (!document.getElementById('main_dev').value) {
		document.getElementById('main_msg').innerHTML = '<span style="color:#ff0000">Please select a development option</span>';
	} else {
		var price = opt[document.getElementById('main_opt').value] + dev[document.getElementById('main_dev').value];
		var package = 'K0'+document.getElementById('main_opt').value+document.getElementById('main_dev').value;
		document.getElementById('main_msg').innerHTML = 'Your maintenance package is only <strong>&pound;'+price+'</strong> (+VAT)<br>To book this maintenance package, call <strong>0131 208 2038</strong> now and quote <strong>'+package+'</strong>';
	}
}