validation javascript(clientside) not working in html editor

function ValidateFrom() {

debugger;

var editor1 = $find("<%=Editor1.ClientID%>");

var content1 = editor1.get_content();

if (content1.trim() == "") {

document.getElementById("<%=divDesMsg.ClientID %>").innerHTML = "Please enter Description.";

document.getElementById("<%=divDesMsg.ClientID %>").style.display = 'block';

document.getElementById("<%=Editor1.ClientID %>").focus();

return false;

}

}

 

here i am checking value is available or not: