function isEmpty(info)
   {
	   if ((info==null )||(info==""))
		    return true;
	   else
		    return false;
    }
	
function isNum(info)
{
	   var num=new Array("1","2","3","4","5","6","7","8","9","0");
	   var inputstr=info.toString();
	   var length=inputstr.length;
	   var flag=0;
	   for (var i=0;i<length;i++)
		 {
		   for (var j=0;j<num.length;j++)
			{
		        if (inputstr.charAt(i)==num[j])
				  {
				     flag++;
				  }
			}
		}
		    if(flag==0)
			   return false;
			else
			   return true;
}

function isChar(info)
{
	   var num=new Array("1","2","3","4","5","6","7","8","9","0");
	   var inputstr=info.toString();
	   var length=inputstr.length;
	   var flag=0;
	   for (var i=0;i<length;i++)
		 {
		   for (var j=0;j<num.length;j++)
			{
		        if (inputstr.charAt(i)==num[j])
				  {
				     flag++;
				  }
			}
		}
		    if(flag==length)
			   return false;
			else
			   return true;
}

 function isMail(info)
{
       var inputstr=info.toString();
       if ((inputstr.indexOf("@")==-1) || (inputstr.indexOf(".")==-1))
	       return false;
	   else
	       return true;
}