String.prototype.trim = function() {
	return this.replace(/^\s+|\s+$/g,"");
}
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) { //v4.01
  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 ShowTab(tab,id) {
	document.getElementById('Tab1').style.display = 'none';
	document.getElementById('Tab2').style.display = 'none';
	document.getElementById('Tab3').style.display = 'none';
	document.getElementById('Tab4').style.display = 'none';
	document.getElementById(tab).style.display = 'block';
}

function validate_make() {
	make_name = document.getElementById('make');
	if (!make_name || make_name.value.trim() == '' || make_name.value == 'enter new make') {
		alert("Invalid Make name");
		return false;
	}
	return true;
}

function validate_model() {
	model_name = document.getElementById('model');
	if (!model_name || model_name.value.trim() == '' || model_name.value == 'enter new model') {
		alert("Invalid Model name");
		return false;
	}
	return true;
}

function validate_car() {
	reference_id = document.getElementById('reference_id');
	if (!reference_id || reference_id.value.trim() == '') {
		alert("Invalid Reference ID");
		return false;
	}
	return true;
}

function createRequestObject(){
	try	{
		xmlhttp = window.XMLHttpRequest ? new XMLHttpRequest() : new ActiveXObject("Microsoft.XMLHTTP");
	}	catch(e)	{
		alert('Sorry, but your browser doesn\'t support XMLHttpRequest.');
	};
	return xmlhttp;
}

var bustcachevar=1; //bust potential caching of external pages after initial request? (1=yes, 0=no)
var bustcacheparameter="";

function ajaxpage(url, containerid, requesttype){
	var page_request = createRequestObject();
	if (requesttype=='get'){
		if (bustcachevar) bustcacheparameter=(url.indexOf("?")!=-1)? "&"+new Date().getTime() : "?"+new Date().getTime();
		page_request.open('GET', url+bustcacheparameter, true);
		page_request.send(null);
	} else if (requesttype=='post') {
		page_request.open('POST', url, true);
		page_request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
		page_request.setRequestHeader("Content-length", poststr.length);
		page_request.setRequestHeader("Connection", "close");
		page_request.send(poststr);
	};

	page_request.onreadystatechange=function() {
		if (page_request.readyState == 4 && (page_request.status==200 || window.location.href.indexOf("http")==-1)) {
			document.getElementById(containerid).innerHTML=page_request.responseText;
		}
	}
}