SCRIPT5009: 'isCheckSign' is undefined

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Javascript

IE10

IE11

when I open a webpage, and entry some data, its description doesn't show in "gender_desc" textfield, a error occurs. It happens in IE11\IE10, while it's normal in IE10 compatibility view and IE10 below.

error:SCRIPT5009: 'isCheckSign' is undefined
code:

<input name="gender" id="gender" value="" size="5" tableName="T_GENDER" whereClause=" gender_code  not like 'N'" isCheckSign="true"  önblur="javascript:this.value=this.value.toUpperCase(); if(isCheckSign){
      var resultTagSelf=
showDescWithArray('gender','gender_desc',new Array(new Array('M','M','Male'),new Array('F','F','Female')),'Invalid gender entered','/ls');_dealDeadlock(resultTagSelf);}if(resultTagSelf){checkGender();}"  class='textfiled' maxLength="5" notNull="true">
<input name='gender_desc' size='18' disabled value=""class='textfiled_ro'>