function checkEngNum(){
   var charCode=event.keyCode;  
   if(charCode!=13 && charCode<48 || charCode>57 && charCode<65 || charCode>90 && charCode<97 || charCode>122){
      event.returnValue=false;
   }   
}
function checkEngSpace(){
   var charCode=event.keyCode;  
   if(charCode!=13 && charCode!=32 && charCode<65 || charCode>90 && charCode<97 || charCode>122){
      event.returnValue=false;
   }   
}
function checkNotSpace(){
   var charCode=event.keyCode;  
   if(charCode==32){
      event.returnValue=false;
   }
}
function checkNumber(){
   var charCode=event.keyCode;  
   if(charCode!=13 && charCode<48 || charCode>57){
      event.returnValue=false;
   }
}