function refreshRegTotal(changedTuit){
    var val = changedTuit.value;
    for(var n=0; n<val.length; n++){
        if(!isDigit(val.charAt(n))){
            alert("Tutition Values must be Numeric");
            changedTuit.value = "";
            changedTuit.focus();
        }
    }
    
    var tuition = Number(eTuition1.value) + Number(eTuition2.value) + 
                  Number(eTuition3.value) + Number(eTuition4.value) + 
                  Number(eTuition5.value) + Number(eTuition6.value);
                  
    document.getElementById('eBalance').value = "$"+tuition
}
function isDigit(num) {
   if (num.length>1){return false;}
   var string="1234567890";
   if (string.indexOf(num)!=-1){return true;}
   return false;
}
function changeHighlight(check) {
    var liName = "li_" + check.name;
    if(check.checked) changeClass(liName,"mySelectedLi");
    else changeClass(liName,"myLi");

}
function changeClass(Elem, myClass) {
    var elem;
    if(document.getElementById) {
        var elem = document.getElementById(Elem);
    } else if (document.all){
        var elem = document.all[Elem];
    }
    elem.className = myClass;
}
//Function for Email Validation
function echeck(str) {
   var at="@";
   var dot=".";
   var lat=str.indexOf(at);
   var lstr=str.length;
   var ldot=str.indexOf(dot);
   if ((str.indexOf(at)==-1)||
       (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr)||
       (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr)||
       (str.indexOf(at,(lat+1))!=-1)||
       (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot)||
       (str.indexOf(dot,(lat+2))==-1)||
       (str.indexOf(" ")!=-1)){
      return false;
   }
   return true;
}
function checkform() {
    var myForm = document.getElementById('regForm');
    
    if(myForm.eName.value == "") {
        alert( "You Must Enter Student Name." );
        myForm.eName.focus();
        return false;
    }
    else if(myForm.ePhone.value == "") {
        alert( "You Must Enter Phone Number." );
        myForm.ePhone.focus();
        return false;
    }
    else if(myForm.eEmail.value != "" && !echeck(myForm.eEmail.value)) {
        alert( "Invalid Email Address." );
        myForm.eEmail.focus();
        return false;
    }
    /*else if((myForm.Class1.value == "") && (myForm.Class2.value == "") && (myForm.Class3.value == "") &&
            (myForm.Class4.value == "") && (myForm.Class5.value == "") && (myForm.Class6.value == "")) {
        alert( "You Must Enter at least one Class." );
        return false;
    }*/

    else myForm.submit();

}
function checkEnter(e){
    var characterCode; 
      
    if(e && e.which){
        e = e;
        characterCode = e.which ;
    } else {
        characterCode = e.keyCode ;
    }
      
    if(characterCode == 13){
        checkform();
        return false
    } else return true;

}