function checkBtn()
{strCmtL = document.getElementById("strComment").value.length;if ((strCmtL > 0) && (strCmtL <= 20480) && (document.getElementById("strSubject").value.length > 0)) document.getElementById("btnSend").disabled = false;else document.getElementById("btnSend").disabled = true;if (strCmtL <= 20480) document.getElementById("msglenst").style.display = "none";else document.getElementById("msglenst").style.display = "";}