function maxLength(field,maxChars)
 {
       if(field.value.length >= maxChars) {
          event.returnValue=false;
          return false;
       }
 }  

 function maxLengthPaste(field,maxChars)
 {
       event.returnValue=false;
       if((field.value.length +  window.clipboardData.getData("Text").length) > maxChars) {
         return false;
       }
       event.returnValue=true;
 }
  function gosterBitisTarihi()
 {
       if(document.getElementById("bitisT").style.display=="block"){
       	document.getElementById("bitisT").style.display="none";
       }else{
       	document.getElementById("bitisT").style.display="block";
       }
 }