Remove the spaces before begin and after end of text

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<html>
<head><title>Remove the spaces before begin and after end of text</title>
<script>
function ChkSpace(txtval)
{
var i,j;
j=0;
for(i=0;i<txtval.length;i++)
{
    j++
    if(txtval.substr(i,1)!=" ")
        break;
}
txtval=txtval.substr(j-1,txtval.length);
if(txtval==" ")
   txtval="";
return(txtval);
}

function Check()
{
var txtval=document.frm.txtarea.value;
txtval=ChkSpace(txtval);
document.frm.txtarea.value=txtval;
}
</script>
</head>

<body>
<form name=frm>
    <textarea name=txtarea cols=50 rows=10></textarea>
    <input type=button value="Check" onclick="Check()">
</form>
</body>
</html>