function trimcode(str){
 str = str.toLowerCase();//全部转为小写
 str=str.replace(/(^\s*)|(\s*$)/g, "");//删除左右两端的空格
 var reg=new RegExp(" ","g"); //创建正则RegExp对象
 str=str.replace(reg,"_");
 return encodeURI(str);//编码
}

function wsearch() {
   var sform=document.getElementById('search_form');
   var key=document.getElementById('kword');
	if (key.value == "")
	{
	alert("Please input a word.");
	 key.focus();
	 return false;
	}
	else {
    sform.action="http://www.cnmed.net/sw/"+trimcode(key.value);
	sform.submit();
	}
   }

function IsValid(e)
{
var evt = window.event|| e;
if (evt.keyCode == 13)
    {
	var sform=document.getElementById('search_form');
    var key=document.getElementById('kword');
    if (key == "")
	{
	alert("Please input a word.");
	 key.focus();
	 return false;
	}
	else {
    sform.action="http://www.cnmed.net/sw/"+trimcode(key.value);
	sform.submit();
	}
    }
}