function isMibile(s)
{
    var flg = false;
    //var field13 = /^13\d{9}$/g;
   	//var field15 = /^15[0,1,2,3,5,6,7,8,9]\d{8}$/g;
   	//var field18 = /^18[0,5,6,7,8,9]\d{8}$/g;
   	
   	var field13 = /^13\d{9}$/g;
   	var field15 = /^15[0,1,2,3,5,6,8,9]\d{8}$/g;
   	var field18 = /^18[0,5,6,7,8,9]\d{8}$/g;
   	

   	var field19 = /^((\(\d{3}\))|(\d{3}\-))?13[0-9]\d{8}|15[89]\d{8}$/g;
   	var field20 = /^[6,8]\d{7}$/g;
   	
    if((field13.exec(s)) || (field15.exec(s))||(field18.exec(s))||(field20.exec(s)))
    {   
         flg = true;
    }
    else 
    {   
         flg = false;
    }    
    return flg;
}