function trim(str){
   return str.replace(/^\s*|\s*$/g,"");
}

function entered(field){
  if (trim(document.getElementById(field).value)==""){
		if (document.getElementById(field).type !="hidden"){
			document.getElementById(field).focus();
		}
		return false;
   }else{
		return true;
   }
}

function isInteger(number){   
    var reInteger = /^\d+$/;
    return reInteger.test(trim(number));
}

function valid_email(field){   
	var email=trim(document.getElementById(field).value);
	var reEmail =/(^[a-z]([a-z_\.]*)@([a-z_\.]*)([.][a-z]{3})$)|(^[a-z]([a-z_\.]*)@([a-z_\.]*)(\.[a-z]{3})(\.[a-z]{2})*$)/i;
	if (email!=""){
		return reEmail.test(email);
	}
	return true;
}

function valid_postcode (Field){  
	var postcode=trim(document.getElementById(Field).value);  
	if(isInteger(postcode) && postcode.length == 4){  
		return true;
	}else{
		return false;
	}
}

function confirmDelete(className,id,page){
	$res=confirm("Are you sure you want to delete this record?");
	if ($res){
		xajax_delete(className,id,page);
	}
	return false;
}

function confirmPermanentDelete(className,id,page){
	$res=confirm("Are you sure you want to PERMANENTLY delete this entry from the system?");
	if ($res){
		xajax_permanentDelete(className,id,page);
	}
	return false;
}

function validate_logon(){
	if (!entered("userLogon")){
		alert("Please enter a User Name");
		return false;
	}
	if (!entered("userPassword")){
		alert("Please enter a Password");
		return false;
	}
	xajax_logon(xajax.getFormValues("logonForm"));
	return false;
}  

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) { //v3.0
  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); 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];}
}