/*DO NOT DELETE
	These functions are used in each html/asp page for the main menu functionality.
	In each page you should find the following code:
	
	<script language="JavaScript" src="../scripts/js_functions.js"></script>
*/
	
	function popup_cookies_text(){
		window.open("../miscellaneous/cookies_text.htm", "popupCookies", "width=600, height=340");
	}
	
	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 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_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_findObj(n, d) { //v4.0
	  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 && document.getElementById) x=document.getElementById(n); return x;
	}		
	
	/* sets focus on the specified form field */
	function setFocus(aForm, aField) {
		document.forms[aForm][aField].focus();
	}
	
	function checkAbsenteeForm() {
		var nameField = document.absentee_form.ParticipantName;
		var emailField = document.absentee_form.ParticipantEmail;
		var reasonField = document.absentee_form.Reason;
		
		if (nameField.value == "") {
			alert("Must specify your full Name; it cannot be blank.");
			setFocus("absentee_form", "ParticipantName");
			return(false);
		}
		if (!(isEmail(emailField)) || (emailField.value == "")) {
			alert("Not a valid Email address; must be of the form a@b.c");
			setFocus("absentee_form", "ParticipantEmail");
			return(false);
		}
		if (reasonField.value == "") {
			alert("Must specify a detailed reason; it cannot be blank.");
			setFocus("absentee_form", "Reason");
			return(false);
		}				
		return true;
	}
	
	/* Checks to see if email address is of the form a@b.c */
	function isEmail(addr)
	{   var atIndex, str;  								
		
		if (addr.value.length<5) {
			return false;
		}
		else {
			atIndex = addr.value.indexOf("@")
			if (atIndex < 1) {
				return false;
			}
			else {
				str = addr.value.substring(atIndex+1, addr.value.length-1);
				if (str.indexOf(".") < 1) {
					return false;
				}
				else {
					if (str.length == (str.indexOf(".") + 1)) {
						return false;
					}
					else { 
						return true; 
					}
				}
			}
		}
	}