function trim(str)
{ 
	//删除左右两端的空格
	return str.replace(/(^\s*)|(\s*$)/g, "");
}

function getElementValue(elementId)
{
	var value = "";
	
	var element = document.getElementById(elementId);
	if (element != null)
	{
	    if (element.tagName == "INPUT")
		    value = element.value;
	    else if(element.tagName == "TEXTAREA")
		    value = element.innerHTML;
	    else if(element.tagName == "SELECT")
		    value = element.options[element.selectedIndex].value;
    } 
		
	return value;
}
function A()
{
    var last_emmenia = getElementValue('last_emmenia');
    if (last_emmenia == "")
    {
        alert("请输入上次月经时间。");
        return false;
    }
    
    var emmenia_cycle = getElementValue('emmenia_cycle');
    var emmenia_days = getElementValue('emmenia_days');
    window.open('http://www.yaoliwang.com/tools/safe_period.aspx?smartid=' + (new Date().getTime()) + '&last_emmenia=' + last_emmenia + '&emmenia_cycle=' + emmenia_cycle + '&emmenia_days=' + emmenia_days, 'newwindow');
}