function chkValid(e,valid,rejKey,rejChr)
{
	var ctl = "null|0|8|9|13|27";
	var evt = (window.event) ? window.event.keyCode : (e) ? e.which : "";
	var chr = String.fromCharCode(evt).toUpperCase();
	var rej = ((evt && rejKey && rejKey.toString().indexOf(evt) != -1) || (chr && rejChr && rejChr.indexOf(chr) != -1));
	if (rejKey || rejChr)
	{
		if ((evt && rejKey && rejKey.toString().indexOf(evt) != -1) || (chr && rejChr && rejChr.indexOf(chr) != -1))
		{
			alert("Only Numerical Values are accepted!");
			return false;
		}
	}
	else
	{
		if ((evt && ctl.indexOf(evt) == -1) && (chr && valid.indexOf(chr) == -1))
		{
			alert("Only Numerical Values are accepted!");
			return false;
		}
	}
  return true;
}

function don_sub()
{
	var amt= document.getElementById("amount").value;
	if((amt=='')||(amt==null))
	{
		alert("Enter a amount to Proceed");
		document.getElementById("amount").focus();
		return false;
	}
	else
	{
		if(amt<=0)
		{
			alert("Enter a valid amount");
			document.getElementById("amount").value= '';
			document.getElementById("amount").focus();
			return false;
		}
		else
			return true;
	}
}