function toPage(page){
	var form = document.forms[1];
	if ( isEmpty(form))
	{
		form = document.forms[0];
	}
	if(isNaN(page)){
	// || !page.match(/^\d\d*$/)
		alert("请在跳转页栏里输入整数");
		form.jump.focus();
		return null;
	}
	if(page<=0){
		alert("输入页数必须大于 0");
		form.jump.focus();
		return null;
	}
	
	var num = 1*page;
	
	var total = 1*form.totalPage.value;
	if(num>total){
		alert("输入页数不能大于总页数");
		form.jump.focus();
		return null;
	}
    form.page.value=page;	
	form.submit();	
}

function isEmpty(v) {
	switch (typeof v) {
	case 'undefined':
		return true;
	case 'string':
		if (trim(v).length == 0)
			return true;
		break;
	case 'boolean':
		if (!v)
			return true;
		break;
	case 'number':
		if (0 === v)
			return true;
		break;
	case 'object':
		if (null === v)
			return true;
		if (undefined !== v.length && v.length == 0)
			return true;
		for ( var k in v) {
			return false;
		}
		return true;
		break;
	}
	return false;
}