function showModels(str) {

	if (str.length==0) { 

  		document.getElementById("txtHint").innerHTML="";

  		return;

  	}

	xmlHttp=new XMLHttpRequest();

	if (xmlHttp==null) {

		alert ("Your browser does not support AJAX!");

  		return;

  	} 

	var url="makemodel.php";

	url=url+"?make="+str;

	xmlHttp.onreadystatechange=modelsChanged;

	xmlHttp.open("GET",url,true);

	xmlHttp.send(null);

} 

function modelsChanged() { 

	if (xmlHttp.readyState==4) { 

		document.getElementById("txtHint").innerHTML=xmlHttp.responseText;

		document.getElementById("txtPhoto").innerHTML="";

	}

}



function showSizes(sizestr,make) {

	if (sizestr.length==0) { 

  		document.getElementById("txtSize").innerHTML="";

  		return;

  	}

	xmlHttp=new XMLHttpRequest();

	if (xmlHttp==null) {

		alert ("Your browser does not support AJAX!");

  		return;

  	} 

	var url="makemodel.php";

	url=url+"?model="+sizestr+"&modelmake="+make;

	xmlHttp.onreadystatechange=sizeChanged;

	xmlHttp.open("GET",url,true);

	xmlHttp.send(null);

} 



function sizeChanged() { 

	if (xmlHttp.readyState==4) { 

		document.getElementById("txtSize").innerHTML=xmlHttp.responseText;

		document.getElementById("txtPhoto").innerHTML="";

	}

}



function showBladders(sizestr,make,model) {

	if (sizestr.length==0) { 

  		document.getElementById("txtBladder").innerHTML="";

  		return;

  	}

	xmlHttp=new XMLHttpRequest();

	if (xmlHttp==null) {

		alert ("Your browser does not support AJAX!");

  		return;

  	} 

	var url="makemodel.php";

	url=url+"?size="+sizestr+"&modelmake="+make+"&sizemodel="+model;

	xmlHttp.onreadystatechange=bladderChanged;

	xmlHttp.open("GET",url,true);

	xmlHttp.send(null);

} 



function bladderChanged() { 

	if (xmlHttp.readyState==4) { 

		document.getElementById("txtBladder").innerHTML=xmlHttp.responseText;

	}

}



function showBladderInfo(bladderstr,make,model,size) {

	if (bladderstr.length==0) { 

  		document.getElementById("txtBladderInfo").innerHTML="";

  		return;

  	}

	xmlHttp=new XMLHttpRequest();

	if (xmlHttp==null) {

		alert ("Your browser does not support AJAX!");

  		return;

  	} 

	var url="makemodel.php";

	url=url+"?bladder="+bladderstr+"&modelmake="+make+"&sizemodel="+model+"&bladdersize="+size;

	xmlHttp.onreadystatechange=bladderinfoChanged;

	xmlHttp.open("GET",url,true);

	xmlHttp.send(null);

} 



function bladderinfoChanged() { 

	if (xmlHttp.readyState==4) { 

		document.getElementById("txtBladderInfo").innerHTML=xmlHttp.responseText;

	}

}



function showPhoto(make,model,size) {

	if (make.length==0) { 

  		document.getElementById("txtPhoto").innerHTML="";

  		return;

  	}

	xmlHttp2=new XMLHttpRequest();

	if (xmlHttp2==null) {

		alert ("Your browser does not support AJAX!");

  		return;

  	} 

	var url="makemodel.php";

	url=url+"?showimg=1&modelmake="+make+"&sizemodel="+model+"&bladdersize="+size;

	xmlHttp2.onreadystatechange=photoinfoChanged;

	xmlHttp2.open("GET",url,true);

	xmlHttp2.send(null);

} 



function photoinfoChanged() { 

	if (xmlHttp2.readyState==4) { 

		document.getElementById("txtPhoto").innerHTML=xmlHttp2.responseText;

	}

}