function MM_reloadPage(init) {  //reloads the window if Nav4 resized
  if (init==true) with (navigator) {if ((appName=="Netscape")&&(parseInt(appVersion)==4)) {
    document.MM_pgW=innerWidth; document.MM_pgH=innerHeight; onresize=MM_reloadPage; }}
  else if (innerWidth!=document.MM_pgW || innerHeight!=document.MM_pgH) location.reload();
}
MM_reloadPage(true);

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 jsopen(URL) {
	day = new Date();
	id = day.getTime();
	eval("page" + id + " = window.open(URL, '" + id + "', 'toolbar=0,scrollbars=1,location=0,statusbar=0,menubar=0,resizable=1,width=400,height=500');");
}

function openNewWindow(url,width,height) {
	day = new Date();
	id = day.getTime();
	eval("page" + id + " = window.open(url, '" + id + "', 'toolbar=0,scrollbars=1,location=0,statusbar=0,menubar=0,resizable=1,width=" + width + ",height=" + height + "');");
}

function changeClass(obj){
	EL=obj.value;
	document.getElementById(obj.value).className= (obj.checked) ? 'skylight-colour-cell-hover' : 'skylight-colour-cell';
}

function colourChoice(id,total,colour){
	objCell=document.getElementById('colourCell'+id);
	objCell.className='skylight-colour-cell-chosen';
	objRadio=document.getElementById('colourRadio'+id); 
	objRadio.checked=true
	objSelect=document.getElementById('skylight_colour');
	objSelect.value=colour;
	ticker = 0
	while (ticker < total){
		ticker = ticker + 1;
		objCell=document.getElementById('colourCell'+ticker);
		if (ticker != id){
			objCell.className='skylight-colour-cell';	
		}
	}
}

function roundNumber(rnum,dp) {
var rlength = dp;
if (rnum > 8191 && rnum < 10485) {
rnum = rnum-5000;
var newnumber = Math.round(rnum*Math.pow(10,rlength))/Math.pow(10,rlength);
newnumber = newnumber+5000;
} else {
var newnumber = Math.round(rnum*Math.pow(10,rlength))/Math.pow(10,rlength);
}
return newnumber;
}

function submitform() {
	document.paypalform.submit();
} 

function inches2mm(){
	objInches=document.getElementById('inches');
	var inches = objInches.value;
	convertedMilimetres = roundNumber(parseFloat(inches)*25.4,'0');
	objMm=document.getElementById('milimetres');
	objMm.value= convertedMilimetres;
}

function external_blank() {
	if (!document.getElementsByTagName) return;
	var anchors = document.getElementsByTagName("a");
	for (var i=0; i<anchors.length; i++) {
		var anchor = anchors[i];
		if (anchor.getAttribute("href") && anchor.getAttribute("rel") == "external"){
			anchor.target = "_blank";
		}
	}
}
window.onload = external_blank;