function checkBrowser() {
	//this script writes the foreground layer of an overlay,
	//provided the user has Netscape 4.0+ or IE 4.0+
	<!--
	var browser=navigator.appName;
	var version=navigator.appVersion
	var ver1=version.substring(0,1)

	if (((browser == "Netscape") && (ver1 >= 4)) | 
	((browser == "Microsoft Internet Explorer") && (ver1 >= 4))) {
	document.write("<span class=shadow3 id=layer3>Overlay text here</span>")
	}
}

function updatesum() {
  form = document.Koulutus;
  form.totalsum_Euro.value = 0;


 if (form.jasen[0].value = "Jasen") {
    if (form.perjantai.checked) {
        form.totalsum_Euro.value = (form.totalsum_Euro.value-0) + 150;
    }
    if (form.lauantai.checked) {
        form.totalsum_Euro.value = (form.totalsum_Euro.value-0) + 100;
    }
 } else { 
    if (form.perjantai = true) {
        form.totalsum_Euro.value = (form.totalsum_Euro.value-0) + 120;
    }
    if (form.lauantai.checked) {
        form.totalsum_Euro.value = (form.totalsum_Euro.value-0) + 100;
    }
 }

}