var dates = new Array;
var dateassociations = new Array;
var datecount = 1;
function checkrequired(formobj) {
	// Checks that required fields are filled in.
	// Required fields are those with class="required"

	var error = checkrequirednode(formobj);
	// Check date fields
	for(var count = 1; count < datecount; count++) {
		if(dates[count]['day'] != '' || dates[count]['month'] != '' || dates[count]['year'] != '') {
			var name = dates[count]['prefix'];
			if(dates[count]['id'] != '') {
				var labels = document.getElementsByTagName('label');
				for(var labelcount = 0; labelcount < labels.length; labelcount++) {
					var label = labels[labelcount];
					if(label.htmlFor == dates[count]['id']) {
						name = gettextcontents(label);
					}
				}
			}
			if(dates[count]['day'] == '' || dates[count]['month'] == '' || dates[count]['year'] == '') {
				// Incomplete date. Error.
				error += 'Date in "'+name+'" is incomplete.\n';
			} else {
				// Check date validity
				var valid = true;
				var day = dates[count]['day'];
				var month = dates[count]['month'];
				var year = dates[count]['year'];
				var pattern = /^[0-9]{1,2}$/;
				if(!pattern.test(day)) {
					error += 'Day in "'+name+'" is invalid.\n';
					valid = false;
				}
				var pattern = /^[0-9]{1,2}$/;
				if(!pattern.test(month)) {
					error += 'Month in "'+name+'" is invalid.\n';
					valid = false;
				}
				var pattern = /^([0-9]{1,2}|[0-9]{4})$/;
				if(!pattern.test(year)) {
					error += 'Year in "'+name+'" is invalid.\n';
					valid = false;
				}
				if(valid) {
					if(year.length == 1) year = '200' + year;
					if(year.length == 2) year = '20' + year;
					day = parseInt(day, 10);
					month = parseInt(month, 10);
					year = parseInt(year, 10);
					if(year < 1970) {
						error += 'Year in "'+name+'" is too low.\n';
						valid = false;
					}
					if(valid) {
						if(month < 1) {
							error += 'Month in "'+name+'" is too low.\n';
							valid = false;
						} else if(month > 12) {
							error += 'Month in "'+name+'" is too high.\n';
							valid = false;
						} else if(month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12) {
							var daysinmonth = 31;
						} else if(month == 2) {
							if(year % 4 == 0 && (year % 10 != 0 || year % 100 == 0)) { 
								var daysinmonth = 29;
							} else {
								var daysinmonth = 28;
							}
						} else { 
							var daysinmonth = 30;
						}
						if(valid) {
							if(day < 1) {
								error += 'Day in "'+name+'" is too low.\n';
								valid = false;
							} else if(day > daysinmonth) {
								error += 'Day in "'+name+'" is too high.\n';
								valid = false;
							}
						}
					}
				}
			}
		} else {
			// Empty. Nothing needs to be done here (if this is a required field it is dealt with in the
			// required field check).
		}
	}
	if(error != '') {
		alert('Error saving record:\n'+error);
		return false;
	} else {
		return true;
	}
}
function checkrequirednode(obj) {
	var error = '';
	for(var count = 0; count < obj.childNodes.length; count++) {
		var node = obj.childNodes[count];
		var tag = new String(node.tagName);
		tag = tag.toLowerCase();
		if(tag == 'input' || tag == 'select' || tag == 'textarea') {
			var objclasses = ' ' + node.className + ' ';
			// Check required fields
			if(objclasses.indexOf(' required ') != -1) {
				if(node.value == '' && node.disabled == false) {
					var name = node.name;
					if(node.id != '') {
						var labels = document.getElementsByTagName('label');
						for(var labelcount = 0; labelcount < labels.length; labelcount++) {
							var label = labels[labelcount];
							if(label.htmlFor == node.id) {
								var labelname = gettextcontents(label);
								name = labelname;
							}
						}
					}
					error += 'Required field "'+name+'" not filled in.\n';
				}
			}
			// Check numeric fields
			if(objclasses.indexOf(' numeric ') != -1) {
				var pattern = /^\-?[0-9,]*\.?[0-9,]*$/;
				if(!pattern.test(node.value) && node.disabled == false) {
					var name = node.name;
					if(node.id != '') {
						var labels = document.getElementsByTagName('label');
						for(var labelcount = 0; labelcount < labels.length; labelcount++) {
							var label = labels[labelcount];
							if(label.htmlFor == node.id) {
								name = gettextcontents(label);
							}
						}
					}
					error += 'Field "'+name+'" must be a number.\n';
				}
			}
			// Get date fields into array
			if(objclasses.indexOf(' date ') != -1 && node.disabled == false) {
				if(node.name.indexOf('day') == node.name.length - 3) {
					var prefix = node.name.substr(0, node.name.length - 3);
					if(dateassociations[prefix]) {
						var number = dateassociations[prefix];
					} else {
						var number = datecount;
						dateassociations[prefix] = number;
						//alert('1: '+node.name+' '+prefix+' '+dateassociations[prefix]);
						dates[number] = new Array;
						datecount++;
					}
					dates[number]['day'] = node.value;
					dates[number]['id'] = node.id;
					dates[number]['prefix'] = prefix;
				}
				if(node.name.indexOf('month') == node.name.length - 5) {
					var prefix = node.name.substr(0, node.name.length - 5);
					if(dateassociations[prefix]) {
						var number = dateassociations[prefix];
					} else {
						var number = datecount;
						dateassociations[prefix] = number;
						//alert('2: '+node.name+' '+prefix+' '+dateassociations[prefix]);
						dates[number] = new Array;
						datecount++;
					}
					dates[number]['month'] = node.value;
				}
				if(node.name.indexOf('year') == node.name.length - 4) {
					var prefix = node.name.substr(0, node.name.length - 4);
					if(dateassociations[prefix]) {
						var number = dateassociations[prefix];
					} else {
						var number = datecount;
						dateassociations[prefix] = number;
						//alert('3: '+node.name+' '+prefix+' '+dateassociations[prefix]);
						dates[number] = new Array;
						datecount++;
					}
					dates[number]['year'] = node.value;
				}
			}
		} else {
			// Check all child nodes
			error += checkrequirednode(node);
		}
	}
	return error;
}
function gettextcontents(node) {
	var textcontents = '';
	for(var childcount = 0; childcount < node.childNodes.length; childcount++) {
		if(node.childNodes[childcount].nodeType == 3) {
			// TEXT_NODE
			textcontents += node.childNodes[childcount].data;
		} else {
			textcontents += gettextcontents(node);
		}
	}
	return textcontents;
}