// JavaScript Document
function inchcalc()
{
	var inch = Number(document.getElementById("txtlength").value);
	var size = Number(document.getElementById("txtsize").value);
	
	
	if(inch !='' && size !='')
	{
		var val = inch * 39.37;
		document.getElementById("txtinch").value = val;
		if(Number(size)+0 == 0)
		{
			alert('please enter the value greater than zero');
		}else{
			var calc = val / (1000 * size);
			document.getElementById("txtpiece").value = calc;
		}
	}
	
	if(inch =='' && size !='')
	{
		document.getElementById("display").innerHTML = "please enter the length per ton";
	}
	if(inch !='' && size =='')
	{
		document.getElementById("txtinch").value = inch * 39.37;
	}
	if(inch =='' && size =='')
	{
		document.getElementById("txtinch").value ='';
		document.getElementById("txtpiece").value ='';
	}

}