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 validate_required(field,alerttxt)
{
	with (field)
	{
		if (value==null||value==""){
  			alert(alerttxt);
			return false
		}
		if(name=="email"){
			return validate_email(field)
		}
		if(name=="passportLetter"){
			if(!isChar(value)){
				alert("Please enter valid passport number");
				return false;
			}
		}
		if(name=="passportNumber"){
			if(!isInteger(value)){
				alert("Please enter valid passport number");
				return false;
			}
		}
		if(name=="postcode"){
			if(!isInteger(value)||(value.length!=4)){
				alert("Incorrect postcode format! e.g. 3000");
				return false;
			}
		}
	}
}

function validate_radio(thisform,alerttext){
	if((thisform.marriage[0].checked==false)&&thisform.marriage[1].checked==false){
		alert(alerttext);thisform.marriage[0].focus();return false
	}else
	if((thisform.gender[0].checked==false)&&thisform.gender[1].checked==false){
		alert(alerttext);thisform.gender[0].focus();return false
	}else
	if((thisform.penyandang[0].checked==false)&&thisform.penyandang[1].checked==false){
		alert(alerttext);thisform.penyandang[0].focus();return false
	}else
	if((thisform.pilih[0].checked==false)&&thisform.pilih[1].checked==false){
		alert(alerttext);thisform.pilih[0].focus();return false
	}
	return true
}
function validate_form(thisform){

	var msg = "Semua pertanyaan diperlukan!"
	for(i=0;i<thisform.elements.length;i++){
		if (validate_required(thisform.elements[i],msg)==false)
			{thisform.elements[i].focus();return false}
	}
	if(validate_radio(thisform,msg)==false){
		return false;
	}
	else{
		alert("Terima Kasih atas partisipasi anda");
		return true
	}
}

function validate_email(field)
{
	with (field)
	{
	var msg = "Please enter valid email"
	apos=value.indexOf("@")
	dotpos=value.lastIndexOf(".")
	if (apos<1||dotpos-apos<2) 
  		{alert(msg);return false}
	else {return true}
	}
}

function disableOption(field){	
	if(field.value=="Ya"){
		document.form2.cacat.disabled=false;
		document.form2.cacat.value="";
	}else{
		document.form2.cacat.disabled=true;
		document.form2.cacat.value="None";
	}
}

function isInteger(s){
	var i;
    for (i = 0; i < s.length; i++){   
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
	return true;
}

function isChar(s){
	var i;
    for (i = 0; i < s.length; i++){   
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c > "0") && (c < "9"))) return false;
    }
	return true;
}