/**
 * General Behaviours
 */
 
function FW_addLoadEvent(func) {
/**
 * http://simon.incutio.com/archive/2004/05/26/addLoadEvent
 */
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = func;
  } else {
    window.onload = function() {
      oldonload();
      func();
    };
  }
}

function FW_name2id() {
/**
 * add an id attribute to every element that has a name but no id
 * http://richardathome.no-ip.com/index.php?article_id=300
 */
  var els = document.getElementsByTagName('*');
  for (var i=0; (el = els[i]); i++) {
    if (("" + el.name != "undefined") && (el.id == "")) {
      el.id = el.name;
    }
  }
}
FW_addLoadEvent(FW_name2id);

function FW_isImagesEnabled() {
	/* checks if images is enabled in browser, before replacing widgets */
	if (document.createElement && document.getElementsByTagName) {
		var img = document.createElement("img");
		img.onload = FW_formsPrepare;
		img.setAttribute("src", "clear.gif");
	}
}
FW_addLoadEvent(FW_isImagesEnabled);


/** 
 * forms behavior layer
 */
 
function FW_formsPrepare () {
	FW_formsEnhanceCheckbox();
	FW_formsEnhanceRadio();
}
//FW_addLoadEvent(FW_formsPrepare);


function FW_formsEnhanceRadio() {
	// Enhance radio form fields
	var els=document.getElementsByTagName("input");
	for(var i=0; (el=els[i]); i++) {
		if (el.type == "radio") {
			el.style.position = 'absolute';
			el.style.left = '-9999px';
			var img=document.createElement("img");
			img.setAttribute("src", "clear.gif");
			img.setAttribute("width", tx_formwidgets_radioWidth);
			img.setAttribute("height", tx_formwidgets_radioHeight);
			img.className=((el.checked)?"tx-formwidgets-radio2":"tx-formwidgets-radio1")+((el.disabled)?" tx-formwidgets-radiodisabled":"");
			img.onclick = FW_toggleRadio;
			if (tx_formwidgets_enableMouseover) {
				img.onmouseover = FW_mouseoverRadio;
				img.onmouseout = FW_mouseoutRadio;
			}
			if (tx_formwidgets_enableFocus) {
				el.onfocus = FW_focusRadio;
				el.onblur = FW_blurRadio;
			}
			el.onclick = FW_toggleRadioImage;
			el.parentNode.insertBefore(img, el);
		}
	}
}

function FW_focusRadio() {
	this.previousSibling.className = ((this.checked)?"tx-formwidgets-radio4":"tx-formwidgets-radio3")+((this.disabled)?" tx-formwidgets-radiodisabled":"");
}
function FW_blurRadio() {
	this.previousSibling.className = ((this.checked)?"tx-formwidgets-radio2":"tx-formwidgets-radio1")+((this.disabled)?" tx-formwidgets-radiodisabled":"");
}

function FW_mouseoverRadio() {
	if (!this.nextSibling.disabled) { this.className = ((this.nextSibling.checked)?"tx-formwidgets-radio4":"tx-formwidgets-radio3"); }
}
function FW_mouseoutRadio() {
	if (!this.nextSibling.disabled) { this.className = ((this.nextSibling.checked)?"tx-formwidgets-radio2":"tx-formwidgets-radio1"); }
}

function FW_toggleRadioImage() {
	if (!this.disabled) {
		els=this.parentNode.parentNode.getElementsByTagName("input");
		for(var i=0; (el=els[i]); i++) {
			if (el.type == "radio") {
				el.previousSibling.className=((el.checked)?"tx-formwidgets-radio2":"tx-formwidgets-radio1")+((el.disabled)?" tx-formwidgets-radiodisabled":"");
			}
		}
	}
}

function FW_toggleRadio() {
// graphical radio onclick event handler
	if (!this.nextSibling.disabled) {
		// toggle the radio state:
		this.nextSibling.checked=true;
		els=this.parentNode.parentNode.getElementsByTagName("input");
		for(var i=0; (el=els[i]); i++) {
			if (el.type == "radio") {
				el.previousSibling.className=((el.checked)?"tx-formwidgets-radio2":"tx-formwidgets-radio1")+((el.disabled)?" tx-formwidgets-radiodisabled":"");
			}
		}
	}
}

function FW_formsEnhanceCheckbox() {
	// Enhance checkbox form fields
	var els=document.getElementsByTagName("input");
	for(var i=0; (el=els[i]); i++) {
		if (el.type == "checkbox") {
			el.style.position = 'absolute';
			el.style.left = '-999px';
			var img=document.createElement("img");
			img.setAttribute("src", "clear.gif");
			img.setAttribute("width", tx_formwidgets_checkboxWidth);
			img.setAttribute("height", tx_formwidgets_checkboxHeight);
			img.className=((el.checked)?"tx-formwidgets-checkbox2":"tx-formwidgets-checkbox1")+((el.disabled)?" tx-formwidgets-checkboxdisabled":"");
			img.onclick= FW_toggleCheckbox;
			if (tx_formwidgets_enableMouseover) {
				img.onmouseover = FW_mouseoverCheckbox;
				img.onmouseout = FW_mouseoutCheckbox;
			}
			if (tx_formwidgets_enableFocus) {
				el.onfocus = FW_focusCheckbox
				el.onblur = FW_blurCheckbox
			}
			el.onclick= FW_toggleCheckboxImage;
			el.parentNode.insertBefore(img, el);
		}
	}
}

function FW_focusCheckbox() {
	this.previousSibling.className = ((this.checked)?"tx-formwidgets-checkbox4":"tx-formwidgets-checkbox3")+((this.disabled)?" tx-formwidgets-checkboxdisabled":"");
}
function FW_blurCheckbox() {
	this.previousSibling.className = ((this.checked)?"tx-formwidgets-checkbox2":"tx-formwidgets-checkbox1")+((this.disabled)?" tx-formwidgets-checkboxdisabled":"");
}

function FW_mouseoverCheckbox() {
	if (!this.nextSibling.disabled) { this.className = ((this.nextSibling.checked)?"tx-formwidgets-checkbox4":"tx-formwidgets-checkbox3"); }
}
function FW_mouseoutCheckbox() {
	if (!this.nextSibling.disabled) { this.className = ((this.nextSibling.checked)?"tx-formwidgets-checkbox2":"tx-formwidgets-checkbox1"); }
}

function FW_toggleCheckboxImage() {
	if (!this.disabled) { this.previousSibling.className=(this.checked)?"tx-formwidgets-checkbox2":"tx-formwidgets-checkbox1"; }
}

function FW_toggleCheckbox() {
	// graphical checkbox onclick event handler
	// toggle the checkbox state:
	if (!this.nextSibling.disabled) {
		if (this.nextSibling.checked) {
			this.className="tx-formwidgets-checkbox1";
			this.nextSibling.checked=false;
		}
		else {
			this.className="tx-formwidgets-checkbox2";
			this.nextSibling.checked=true;
		}
	}
}