/*
Set windows to open in a blnak window
*/
function externalLinks() {
 if (!document.getElementsByTagName) return;
 var anchors = document.getElementsByTagName("a");
 for (var i=0; i<anchors.length; i++) {
   var anchor = anchors[i];
   if (anchor.getAttribute("href") &&
       anchor.getAttribute("rel") == "external")
     anchor.target = "_blank";
 }
}
window.onload = externalLinks;

function setformopts (selectedoption) {
	if(selectedoption == "Choose Instructor") {
		document.getElementById("form_instructor").style.display = "";
		document.getElementById("form_subject").style.display = "none";
		document.getElementById("form_room").style.display = "none";
	}
	else if(selectedoption == "Choose Subject") {
		document.getElementById("form_instructor").style.display = "none";
		document.getElementById("form_subject").style.display = "";
		document.getElementById("form_room").style.display = "none";
	}
	else if(selectedoption == "Choose Room Number") {
		document.getElementById("form_instructor").style.display = "none";
		document.getElementById("form_subject").style.display = "none";
		document.getElementById("form_room").style.display = "";
	}
	else {
		document.getElementById("form_instructor").style.display = "none";
		document.getElementById("form_subject").style.display = "none";
		document.getElementById("form_room").style.display = "none";
	}
}
function settab(thistab) {
	//alert(document.MM_sr[0].oSrc);
	//alert(x.oSrc);
	var thiselement = "";
	var thisimage = "";
	for(i = 1; i <= 4; i++) {
		var thisitem = "tab_content_" + i;
		var thisicon = "tab_off_" + i;
		if(i == thistab) {
			thiselement = document.getElementById(thisitem);
			thiselement.style.display = "block";
			thisimage = document.getElementById(thisicon);
			thisimage.src = "images/tab_on_" + i + ".gif";
			document.MM_sr[0].oSrc = "images/tab_on_" + i + ".gif";
			
		}
		else {
			thiselement = document.getElementById(thisitem);
			thiselement.style.display = "none";
			thisimage = document.getElementById(thisicon);
			thisimage.src = "images/tab_off_" + i + ".gif";
			//document.MM_sr[0].oSrc = "images/tab_off_" + i + ".gif";
			
		}
	}
}
function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}
function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}
function viewpageid(thispage, thisid, thiswidth, thisheight) {
	var thiswindow;
	thiswindow = window.open(thispage + '?id=' + thisid, 'viewpage', 'width=' + thiswidth + ',height=' + thisheight + ',scrollbars,resizable');
	thiswindow.focus();
}
function viewpage(thispage, thiswidth, thisheight) {
	var thiswindow;
	thiswindow = window.open(thispage, 'viewpage2', 'width=' + thiswidth + ',height=' + thisheight + ',scrollbars,resizable');
	thiswindow.focus();
}
function viewimage(thisimg, thiswidth, thisheight) {
	var thiswindow;
	thiswindow = window.open('viewimage.php?id=' + thisimg, 'viewphoto', 'width=' + thiswidth + ',height=' + thisheight + ',scrollbars,resizable');
	//alert('viewimage.php?id=' + thisimg);
	thiswindow.focus();
}
function viewphotogallery(thisimg, thiswidth, thisheight) {
	var thiswindow;
	thiswindow = window.open('viewphotogallery.php?id=' + thisimg, 'viewphotogallery', 'width=' + thiswidth + ',height=' + thisheight + ',scrollbars,resizable');
	//alert('viewimage.php?id=' + thisimg);
	thiswindow.focus();
}
function closethiswindow() {
	window.close();
	window.opener.focus();
}
function showtab(tabname) {
	if (tabname == 'monthly') {
		document.getElementById('cal_icon_monthly').className = "cal_on";
		document.getElementById('cal_icon_list').className = "cal_off";
		document.getElementById('calendar_monthly').style.display = 'block';
		document.getElementById('calendar_list').style.display = 'none';
		document.catform.v.value = 'monthly';
	} else {
		document.getElementById('cal_icon_monthly').className = "cal_off";
		document.getElementById('cal_icon_list').className = "cal_on";
		document.getElementById('calendar_monthly').style.display = 'none';
		document.getElementById('calendar_list').style.display = 'block';
		document.catform.v.value = 'list';
	}
}

function caljump() {
	var datefield;
	var dateval;
	
	datefield = document.getElementById("jumpto");
	dateval = datefield.options[datefield.selectedIndex].value;
	//alert('Date Value: ' + dateval);
	if (dateval != '') {
		var datearray = dateval.split('/');
		if (parseInt(datearray[0]) && parseInt(datearray[1])) {
			//alert('Month: ' + datearray[0] + ', Year: ' + datearray[1]);
			//window.location.href = 'calendar.php?m=' + datearray[0] + '&y=' + datearray[1];
			document.catform.m.value = datearray[0];
			document.catform.y.value = datearray[1];
			document.catform.v.value = 'monthly';
			document.catform.submit();
		}
	}	
}

function callistjump() {
	var datefield;
	var dateval;
	
	datefield = document.getElementById("jumpto2");
	dateval = datefield.options[datefield.selectedIndex].value;
	//alert('Date Value: ' + dateval);
	if (dateval != '') {
		var datearray = dateval.split('/');
		if (parseInt(datearray[0]) && parseInt(datearray[1])) {
			//alert('Month: ' + datearray[0] + ', Year: ' + datearray[1]);
			//window.location.href = 'calendar.php?v=list&m=' + datearray[0] + '&y=' + datearray[1];
			document.catform.m.value = datearray[0];
			document.catform.y.value = datearray[1];
			document.catform.v.value = 'list';
			document.catform.submit();
		}
	}	
}

function navmonth(thismonth, thisyear) {
	document.catform.m.value = thismonth;
	document.catform.y.value = thisyear;
	document.catform.v.value = 'monthly';
	document.catform.submit();
}