var flag;
function addloc(locs,mylocs)
{
 if (mylocs.length>10000) alert('您选择的项目超过18个了！请删除部分项目再选！');
 else
 {
 	for(var x=0;x<locs.length;x++)
	{
 		var opt = locs.options[x];
 		if (opt.selected)
 		{
 			flag = true;
 			for (var y=0;y<mylocs.length;y++)
 			{
 				var myopt = mylocs.options[y];
 				if (myopt.value == opt.value) flag = false;
 			}
 			if(flag)
				mylocs.options[mylocs.options.length] = new Option(opt.text, opt.value, 0, 0);
		 }
	}
	
	var kmstring = "";
 	for(var y=0;y<mylocs.length;y++)
	{
 		var opt = mylocs.options[y];
 		kmstring = kmstring + opt.value + "、";
	}	
	if (kmstring.length > 0)
	{
		kmstring = kmstring.substring(0,kmstring.length -1);
	}
	document.getElementById("km").value = kmstring;
 }
}
function delloc(locs,mylocs)
{
	for(var x=mylocs.length-1;x>=0;x--)
	{
	   var opt = mylocs.options[x];
	   if (opt.selected)
		   mylocs.options[x] = null;
	}
	
	var kmstring = "";
 	for(var y=0;y<mylocs.length;y++)
	{
 		var opt = mylocs.options[y];
 		kmstring = kmstring + opt.value + "、";
	}	
	if (kmstring.length > 0)
	{
		kmstring = kmstring.substring(0,kmstring.length -1);
	}
	document.getElementById("km").value = kmstring; 
}