function CountChars(count_field_id,maxchars,output_field_id)
{
     block = document.getElementById(count_field_id).value;	  
     
	 chars = block.length-1;  
     charsleft=maxchars-chars-1;
     if (charsleft <= 0)
     {  
	    charsleft = 0;
	    document.getElementById(count_field_id).value = block.substring(0,maxchars);	
	 }
	
	 document.getElementById(output_field_id).value = charsleft; 
}