function checkForm(formName) {
	var isEmpty = false;
	var isOK = true;
	for (i=0; i<document.forms[formName].length; i++) {
		if ((document.forms[formName].elements[i].type == "text") || (document.forms[formName].elements[i].type == "textarea")) {
			if (document.forms[formName].elements[i].value == "") {
				isEmpty = true;
				break;
			}
		} else if (document.forms[formName].elements[i].type == "select-one") {
			if (document.forms[formName].elements[i].value == 0) {
				isEmpty = true;
				break;
			}
		} else if(document.forms[formName].elements[i].type == "radio") {
			var theRadio = document.forms[formName].elements[i].name;
			for (j=0; j<document.forms[formName].elements[theRadio].length; j++) {
				if (document.forms[formName].elements[theRadio][j].checked) {
					isEmpty = false;
					break;
				} else {
					isEmpty = true;
				}
			}
		}
	}
	
	if (isEmpty) {
		isOK = false;
		window.alert("You did not insert all requested data");
	}
	
	if (isOK) {
		return true;
	} else {
		return false;
	}
}