//显示日期（公共函数）
function showCal(obj)
{
	if (!obj) var obj = event.srcElement;
	var obDate;
	if ( obj.value == "" ) {
		obDate = new Date();
	} else {
		var obList = obj.value.split( "-" );
		obDate = new Date( obList[0], obList[1]-1, obList[2] );
	}
	
	var retVal = showModalDialog( "/cal/dlgCal.htm", obDate, 
		"dialogWidth=206px; dialogHeight=206px; help=no; scroll=no; status=no; " );
		
	if ( typeof(retVal) != "undefined" ) {
		var year = retVal.getFullYear();
		var month = retVal.getMonth()+1;
		var day = retVal.getDate();
		obj.value = year + "-" + month + "-" + day;
	}
}