/* Browser Refs */
ua=navigator.userAgent.toLowerCase();
docEl=document.getElementById?1:0;
IE=document.all&&!window.innerWidth&&ua.indexOf("msie")!=-1?1:0;
NS=docEl&&!document.all&&ua.indexOf("opera")==-1?1:0;
NS4=document.layers?1:0;
MAC=ua.indexOf("mac")!=-1?1:0;

/* Print Functions */
function openPrintable(url){
	window.open("" + url + "",'printable','width=728,height=500,resizable=0,scrollbars=1,menubar=1');
}


/* Form Submission Functions */

function getObj(o){
	return IE?document.all[o]:document.getElementById(o);
}

function addEvent(elNum,event_id){
	var f = document.forms.itineraryform;
	// set action to add when user clicks on event
	f.action.value = "add";
	state = eval("f['ev"+event_id+"']");
	// toggle image & sel property on/off
	if (state.value=="1"){
		selectedId = ("checkboxImg" + [elNum]);
		getObj(selectedId).src=checkboxImgOff.src;
		state.value="0";
	} else {
		selectedId = ("checkboxImg" + [elNum]);
		getObj(selectedId).src=checkboxImgOn.src;
		state.value="1";
	}
}

function removeEvent(elNum,event_id){
	var f = document.forms.myitineraryform;
	// set action to remove when user clicks on event
	f.action.value = "remove";
	state = eval("f['ev"+event_id+"']");
	// toggle image & sel property on/off
	if (state.value=="1"){
		selectedId = ("checkboxImg" + [elNum]);
		getObj(selectedId).src=checkboxImgOff.src;
		state.value="0";
	} else {
		selectedId = ("checkboxImg" + [elNum]);
		getObj(selectedId).src=checkboxImgOn.src;
		state.value="1";
	}
}

function submitDownloadForm(filetype){
	var f = document.forms.itinerarydownloadform;
	// set file type when user clicks on event
	f.ftype.value = filetype;
	f.submit();
}

function filterByEventType(){
	var f = document.forms.eventtypeform;
	f.submit();
}

function checkitineraryform() {
	var f = document.forms['registrationform'];
	var errormsg = "";
	// Make sure none of the required fields are empty
	if(!f.email.value.length > 0){
		errormsg+='- Email Address\n';
	}
	if(!f.password.value.length > 0){
		errormsg+='- Passowrd\n';
	}
	if(!f.confirm_password.value.length > 0){
		errormsg+='- Confirm Password\n';
	}
	if(!f.security_question.value.length > 0){
		errormsg+='- Password Challenge Question\n';
	}
	if(!f.security_answer.value.length > 0){
		errormsg+='- Password Challenge Answer\n';
	}
	if (errormsg!=""){
		alert("Please supply valid information in the following field(s): \n" + errormsg);
		return false;
	}
}

/* Column Header/Sort-by Rollover */
function swapHeader(obj,imgsrc){
	getObj(obj).src = imgsrc;
}

/* Load common buttons */
checkboxImgOff = new Image;
checkboxImgOff.src = "../images/schedule/btn_checkbox.gif";
checkboxImgOn = new Image;
checkboxImgOn.src = "../images/schedule/btn_checkbox_on.gif";
colTimeImgOff = new Image;
colTimeImgOff.src = "../images/schedule/col_time.gif";
colTimeImgOn = new Image;
colTimeImgOn.src = "../images/schedule/col_time_over.gif";
colTypeImgOff = new Image;
colTypeImgOff.src = "../images/schedule/col_type.gif";
colTypeImgOn = new Image;
colTypeImgOn.src = "../images/schedule/col_type_over.gif";
colEventImgOff = new Image;
colEventImgOff.src = "../images/schedule/col_event.gif";
colEventImgOn = new Image;
colEventImgOn.src = "../images/schedule/col_event_over.gif";
colSessionImgOff = new Image;
colSessionImgOff.src = "../images/schedule/col_session.gif";
colSessionImgOn = new Image;
colSessionImgOn.src = "../images/schedule/col_session_over.gif";