zDialog关闭所有弹出的对话框

function CloseAllzDailog()
{	
	var _diag =new Array();
	topWin.$("[id^='_DialogDiv_']").each(function(i,obj){
		var dialog_id = this.id;
		var diag = this.dialogInstance;
		_diag.push(diag);
	});
	_diag = _diag.reverse();
	if(_diag.length>0){
		for(var i =0;i<_diag.length;i++){
			var diag = _diag[i];
			diag.close();
		}
	}
}