function findField(field) {
	return document.getElementById('field' + field);
}

function markError(field) {
	document.getElementById('status'+field).src = 'img/field_error.png';
}
function markClean(field) {
	document.getElementById('status'+field).src = 'img/field_unfilled.png';
}
function markOk(field) {
	document.getElementById('status'+field).src = 'img/field_ok.png';
}

function checkvalue(field, regex, reqFill) {
	var r = new RegExp(regex);
	var f = 'field' + field;
	var s = 'status' + field;
	
	if (/^$/.test(document.getElementById(f).value)) {
		if (reqFill == 1) {
			return false;
		} else {
			return true;
		}
	} else {
		if (r.test(document.getElementById(f).value)) {
			return true;
		} else {
			return false;
		}
	}
}

function checkequal(field, casesensitive) {
	var this_val = document.getElementById('field' + field).value;
	var that_val = document.getElementById('verification' + field).value;
	
	if (!casesensitive) {
		this_val = this_val.toLowerCase();
		that_val = that_val.toLowerCase();
	}
	
	return (this_val && that_val && this_val == that_val);
}

var triggers = new Array()
var fields = new Array()
var inactivefields = new Array()

function isinactive(f) {
	if (f) {
		for (j = 0; j < inactivefields.length; j++) {
			if (inactivefields[j] == f) {
				return true;
			}
		}
	}
	return false;
}

function checkselection(field,reqFill) {
	var f = 'field' + field;
	var s = 'status' + field;
	
	if (document.getElementById(f).selectedIndex == 0) {
		if (reqFill == 1) {
			return false;
		} else {
			return true;
		}
	} else {
		return true;
	}
}

function markinactive(f) {
	if (f && !isinactive(f)) {
		inactivefields.push(f);
	}
}

function markactive(f) {
	for (k = 0; k < inactivefields.length; k++) {
		if (inactivefields[k] == f) {
			inactivefields.splice(k, 1);
			k--;
		}
	}
}

function checktriggers() {
	for (i = 0; i < triggers.length; i++) {
		c = document.getElementById(triggers[i].condition)
		test = false;
		if (c.type == "checkbox") {
			test = c.checked;
		} else {
			test = triggers[i].match.test(c.value);
		}
		
		if (test) {
			markactive(triggers[i].field);
			document.getElementById(triggers[i].target).style.display = 'table-row';
		} else {
			markinactive(triggers[i].field);
			document.getElementById(triggers[i].target).style.display = 'none';
		}
	}
}

function addtrigger(target, condition, match, field) {
	triggers.push({target:target, condition:condition, match:new RegExp(match), field:field});
}

function addcheck(field, check, type, required) {
	fields.push({field:field, type:type, check:check, required:required});
}

function checkfield(field) {
	checktriggers();
	
	if (isinactive(field)) {
		markOk(field);
	} else {
		for (i = 0; i < fields.length; i++) {
			o = fields[i]
			if (o.field == field) {
				if (o.type == 'field') {
					if (checkvalue(o.field, o.check, o.required)) {
						markOk(o.field);
					} else {
						markError(o.field);
					}
				} else if (o.type == 'selection') {
					if (checkselection(o.field,o.required)) {
						markOk(o.field);
					} else {
						markError(o.field);
					}
				} else if (o.type == 'equal') {
					if (!checkequal(o.field, false)) {
						markError(o.field);
					}
				} else if (o.type == 'custom') {
					if ((o.check)()) {
						markOk(o.field);
					} else {
						if (o.required) {
							markError(o.field);
						}
					}
				}
			}
		}
	}
}

function checkfields(markerrors, caller) {
	checktriggers();
	
	errors = false;
	errorfield = '';
	
	for (i = 0; i < fields.length; i++) {
		o = fields[i];
		
		if (isinactive(o.field)) {
			markOk(o.field);
		} else {
			if (o.type == 'field') {
				if (checkvalue(o.field, o.check, o.required)) {
					markOk(o.field);
				} else {
					errors = true;
					if (caller) {
						markError(o.field);
					} else {
						markClean(o.field);
					}
					if (errorfield == '') {
						errorfield = o.field;
					}
				}
			} else if (o.type == 'selection') {
				if (checkselection(o.field,o.required)) {
					markOk(o.field);
				} else {
					errors = true;
					if (caller) {
						markError(o.field);
					} else {
						markClean(o.field);
					}
					if (errorfield == '') {
						errorfield = o.field;
					}
				}
			} else if (o.type == 'custom') {
				if ((o.check)()) {
					markOk(o.field);
				} else {
					if (o.required) {
						errors = true;
						if (errorfield == '') {
							errorfield = o.field;
						}
						markError(o.field);
					} else {
						markClean(o.field);
					}
				}
			}
		}
	}
	if (errors) {
		document.getElementById('field'+errorfield).focus();
	}
	if (caller != null && !errors) {
		document.getElementById(caller).submit();
	}
}