function calc(){
if(document.getElementById('inches').checked==true){
$measure = 'inches';
}
else{
$measure = 'metres'
}
var width=document.getElementById('width').value;
var plength=document.getElementById('plength').value;
var depth = document.getElementById('depth').value;
if($measure=='inches'){
width = (width/3.3);
plength = (plength/3.3);
depth = (depth/3.3);
}
lwidth = (depth * 2) + (width * 1 + 0.3);
lwidth = (lwidth*100);
lwidth = Math.round(lwidth);
lwidth = (lwidth/100);
llength = (depth * 2) + (plength * 1 + 0.3);
llength = (llength*100);
llength = Math.round(llength);
llength = (llength/100);
lwidthi = (depth * 2) + (width * 1 + 0.3);
lwidthi = (lwidthi*330);
lwidthi = Math.round(lwidthi);
lwidthi = (lwidthi/100);
llengthi = (depth * 2) + (plength * 1 + 0.3);
llengthi = (llength*330);
llengthi = Math.round(llengthi);
llengthi = (llengthi/100);
document.getElementById('wout').value=lwidth;
document.getElementById('lout').value=llength;
document.getElementById('wouti').value=lwidthi;
document.getElementById('louti').value=llengthi;
}

function zero(){
document.getElementById('wout').value='';
document.getElementById('lout').value='';
document.getElementById('wouti').value='';
document.getElementById('louti').value='';
}