function checkempty (sender, msg) {
var re = /^\s*$/;  
if (re.test(sender.value)) {
alert("["+msg+"] does not be allowed null! ");
sender.focus();
return false; 
}
return true;
}



function checknum(sender, msg) {
if (sender.value!="")
{
	var re = /^\d/; 
	if (!re.test(sender.value)) {
	alert("["+msg+"] must be a number!");
	sender.select();
	sender.focus();
	return false; 
	}
}
return true;
}



//判断日期格式是否正确
function ValidDate(obj){
   if(!isDate(obj.value)){
       alert("The formation of the date inputted is not valid!");
	   obj.select();
       obj.focus();
   }
}
function init(){		//获得4位随机数
var rnum=String(Math.random());
var rnum2=rnum.substr(2,4);
document.form1.ccode.value=rnum2;
}
function datediff(date1,date2)
{
           var vals = date2.split("-");  
            //取出年份（第一位到第四位）
            var year_ft = vals[0];         
		   var month_ft = vals[1]-1;			    
            var day_ft = vals[2];
            var hour_ft = 0;
            var minitue_ft = 0;
         var vals_lt = date1.split("-");  
            var year_lt = vals_lt[0];
            var month_lt = vals_lt[1]-1;
            var day_lt = vals_lt[2];
            var hour_lt = 0;
            var minitue_lt = 0;
            
            var a = new Date(year_lt, month_lt, day_lt, hour_lt,
minitue_lt); 
            var b = new Date(year_ft, month_ft, day_ft, hour_ft,
minitue_ft); 
            
            var cssj = b.getTime() - a.getTime();
            var days = Math.floor(cssj/(1000*3600*24));
    return days;

}


function RoomNumChange(objNumber_of_Adults,objNumber_of_Rooms)
{
	
	var j = 0;
		
	if (objNumber_of_Adults.length>0)
	{
		for (i=0;i<=20;i++)
		{
			if (objNumber_of_Adults.options[0]!=null)
			{
				objNumber_of_Adults.remove(0);
			}
		}
	}
			
	for (var i=objNumber_of_Rooms.value; i<= objNumber_of_Rooms.value*5;i++)
	{		
		objNumber_of_Adults.options[j] = new Option(i);		
		objNumber_of_Adults.options[j].value = i;
		j++;
	}
	
	return;
									
}

function option_select(s1,s1_value)
{
	for (var i = 0; i < s1.length; i ++)
	{
		if (s1.options[i].value.toLowerCase()==s1_value.toLowerCase())
		{
			s1.selectedIndex = i;
			return;
		}
	}
}