function submitForm(src)	{
	document.getElementById(src).submit();
}

function SelectAll(id, type)
{
    document.getElementById(id).focus();
	if (type == "clear")	{
		document.getElementById(id).value = "";
	} else {
	    document.getElementById(id).select();
	}
}

function convertToFt(src)	{
	var length		= document.getElementById(src).value;
	var total		= (length * 39.3700787) / 12;	
	var feet		= Math.floor(total);
	var remainder	= total - feet;
	var inches		= Math.round(12 * remainder);
	if (inches == 12)	{
		feet++;
		inches = 0;
	}
	var newLength	= feet + "' " + inches + '"';
	
	document.getElementById(src + "_i").innerHTML = newLength;
	
}
// AJAX Functions

var xmlHttp, targetDiv

function calculate_quantity(src, p_unit, p_id)	{

	switch(p_unit)	{
		case "Tonnes":
			var length	= document.getElementById("cLength").value;
			var width	= document.getElementById("cWidth").value;
			var depth	= document.getElementById("cDepth").value;
			url = "return_quantity.php?length=" + length + "&width=" + width + "&depth=" + depth + "&product=" + src + "&p_unit=" + p_unit + "&id=" + p_id;
			break;		
		case "Cubic Meters":		
			var length	= document.getElementById("cLength").value;
			var width	= document.getElementById("cWidth").value;
			var depth	= document.getElementById("cDepth").value;
			url = "return_quantity.php?length=" + length + "&width=" + width + "&depth=" + depth + "&product=" + src + "&p_unit=" + p_unit + "&id=" + p_id;
			break;			
		case "Crate":
			var length	= document.getElementById("cLength").value;
			var width	= document.getElementById("cWidth").value;
			url = "return_quantity.php?length=" + length + "&width=" + width + "&product=" + src + "&p_unit=" + p_unit + "&id=" + p_id;
			break;
		case "Metres":
			var length	= document.getElementById("cLength").value;
			var width	= document.getElementById("cWidth").value;
			url = "return_quantity.php?length=" + length + "&width=" + width + "&product=" + src + "&p_unit=" + p_unit + "&id=" + p_id;		
			break;
		case "Per item":
			var items	= document.getElementById("cNumber").value;
			url = "return_quantity.php?items=" + items + "&product=" + src + "&p_unit=" + p_unit + "&id=" + p_id;		
			break;			
		case "Roll size":		
			break;								
	}	
	
	targetDiv	= "answer";
		
	xmlHttp=GetXmlHttpObject(stateChanged)
	xmlHttp.open("GET", url , true)
	xmlHttp.send(null)
}

function calculate_cost(src, p_unit)	{ 
	targetDiv	= "cost";
	switch(p_unit)	{
		case "Tonnes":
			var postcode	= document.getElementById("cPostcode").value;
			var weight		= document.getElementById("cWeight").value;
			url = "return_cost.php?id="+src+"&postcode="+postcode+"&weight="+weight;
			break;		
		case "Cubic Metres":
			var postcode	= document.getElementById("cPostcode").value;
			var weight		= document.getElementById("cWeight").value;
			url = "return_cost.php?id="+src+"&postcode="+postcode+"&weight="+weight;		
			break;			
		case "Per bulk bag":
			var postcode	= document.getElementById("cPostcode").value;
			var weight		= document.getElementById("cWeight").value;
			url = "return_cost.php?id="+src+"&postcode="+postcode+"&weight="+weight;
			break;
		case "Crate":
			var postcode	= document.getElementById("cPostcode").value;
			var weight		= document.getElementById("cWeight").value;
			url = "return_cost.php?id="+src+"&postcode="+postcode+"&weight="+weight;
			break;
		case "Metres":
			var postcode	= document.getElementById("cPostcode").value;
			var weight		= document.getElementById("cWeight").value;
			url = "return_cost.php?id="+src+"&postcode="+postcode+"&weight="+weight;
			break;
		case "Per item":
			var items	= document.getElementById("cNumber").value;
			var postcode	= document.getElementById("cPostcode").value;			
			url = "return_cost.php?items=" + items + "&product=" + src + "&p_unit=" + p_unit + "&id=" + src +"&postcode=" + postcode;		
			break;
		case "Grab Away":
			var postcode	= document.getElementById("cPostcode").value;
			var weight		= document.getElementById("cWeight").value;
			url = "return_cost.php?id="+src+"&postcode="+postcode+"&weight="+weight;		
			break;
		case "Roll size":		
			break;								
	}	

	xmlHttp=GetXmlHttpObject(stateChanged)
	xmlHttp.open("GET", url , true)
	xmlHttp.send(null)
}


function stateChanged() { 
	if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")	{ 
		document.getElementById(targetDiv).innerHTML=xmlHttp.responseText
	} 
} 

function GetXmlHttpObject(handler)	{ 
	var objXmlHttp=null

	if (navigator.userAgent.indexOf("Opera")>=0)	{
		alert("This example doesn't work in Opera") 
		return 
	}

	if (navigator.userAgent.indexOf("MSIE")>=0)	{ 
		var strName="Msxml2.XMLHTTP"
		if (navigator.appVersion.indexOf("MSIE 5.5")>=0)	{
			strName="Microsoft.XMLHTTP"
		} 
		try
			{ 
			objXmlHttp=new ActiveXObject(strName)
			objXmlHttp.onreadystatechange=handler 
			return objXmlHttp
			} 
		catch(e)
			{ 
			alert("Error. Scripting for ActiveX might be disabled") 
			return 
			} 
		} 

	if (navigator.userAgent.indexOf("Mozilla")>=0)	{
		objXmlHttp=new XMLHttpRequest()
		objXmlHttp.onload=handler
		objXmlHttp.onerror=handler 
		return objXmlHttp
	}
}