// ===== Forms =================================================================

// Check all.
function checkAll(index) {
	lengthOfElements = document.forms[index].elements.length;
	for (var i = 0; i <= lengthOfElements; i++) {
		document.forms[index].elements[i].checked = true;
	}
}

// Check non-empty fields only.
function checkNonEmpty(index) {
	lengthOfElements = document.forms[index].elements.length;
	for (var i = 0; i <= lengthOfElements; i++) {
		if (document.forms[index].elements[i].value) {
			document.forms[index].elements[i].checked = true;
		}
	}
}

// Check none.
function checkNone(index) {
	lengthOfElements = document.forms[index].elements.length;
	for (var i = 0; i <= lengthOfElements; i++) {
		if (document.forms[index].elements[i].value) {
			document.forms[index].elements[i].checked = false;
		}
	}
}

// Reset form:
function resetForm(index) {
	document.forms[index].reset();
}

// Submit an action.
function submitAction(form,action) {
	document.forms[form].setAttribute("action", action);
	document.forms[form].submit();
}

// Show or hide division using pop-up menu and element ID.
function displayDivUsingPopup(formIndex,selectName,optionIndex,elementName) {
	var lengthOfElements = document.getElementsByName(elementName).length
	if (document.forms[formIndex].elements[selectName].selectedIndex == optionIndex) {
		for (var i = 0; i <= lengthOfElements; i++) {
			document.getElementsByName(elementName)[i].style.visibility = "visible";
		}
	}
	else {
		for (var i = 0; i <= lengthOfElements; i++) {
			document.getElementsByName(elementName)[i].style.visibility = "collapse";
		}
	}
}

// Converts a string into an ASCII string.
function stringToASCII(string) {
	// Unicode of non ASCII chars.
	codes = new Array(
	'224','225','226','227','228','229', // ˆ, ‡, ‰, ‹, Š, Œ
	'232','233','234','235',             // �, Ž, �, ‘
	'236','237','238','239',             // “, ’, ”, •
	'242','243','244','245','246',       // ˜, —, ™, ›, š
	'249','250','251','252',             // �, œ, ž, Ÿ
	'223','231','241','32'               // §, �, –, Space
	)
	// Maps non ASCII chars to ASCII chars.
	chars = new Array(
	'a','a','a','a','ae','a',
	'e','e','e','e',
	'i','i','i','i',
	'o','o','o','o','oe',
	'u','u','u','ue',
	'ss','c','n',''
	)
	//
	var newString = "";
	//
	for(var i = 0; i < string.length; i++) {
		var code = string.charCodeAt(i);
		//
		if(code == 45 || (code > 64 && code < 91) || (code > 96 && code < 123)) {
			newString += string.charAt(i);
		}
		else {
			for(var j = 0; j < codes.length; j++) {
				if(code == codes[j]) {
					newString += chars[j];
					break;
				}
			}
		}
	}
	//
	return newString;
}

// Auto short name.
function shortName(shortNames) {
	var arrShortNames = shortNames.toLowerCase().split(",");
	var lastName = document.forms[0].LastName.value.toLowerCase();
	//
	var shortName = stringToASCII(lastName);
	for(var i = 1; i <= arrShortNames.length; i++) {
		var j = 0;
		if(shortName == arrShortNames[i]) {
			j++;
			var shortName = stringToASCII(lastName)+j;
		}
	}
	//
	document.forms[0].ShortName.value = shortName;
	document.forms[0].Homepage.value = "www.arch.udk-berlin.de/"+shortName;
}