function getObj(objName){return(document.getElementById(objName));}
 
function choise(id)
{
	for (var i=1;i<=6;i++)
	{
		var oDiv =document.getElementById("Div_keyword"+i);
		var obj =document.getElementById("select"+i);
		var button =document.getElementById("search_button"+i);
		var img=document.getElementById("img_search"+i);
		
		if (i==id)
		{
			obj.className="ca";
			oDiv.style.display="block";
			button.style.display="block";
			img.style.display="block";
		}
		else
		{	obj.className="cb";
			oDiv.style.display="none";
			button.style.display="none";
			img.style.display="none";
		}
	}
	
var keywords = document.getElementById("searchForm").keywords.value;
if(keywords == "" || keywords=="请输入您感兴趣的产品名称！"|| keywords=="请输入产品或公司名称！"|| keywords=="请输入您感兴趣的资讯关键字！"|| keywords=="请输入您感兴趣的展会关键字！"|| keywords=="请输入您感兴趣的博客关键字！"||keywords=="请输入您感兴趣的论坛关键字！")
 {
	switch(id){
		case 1:
		document.searchForm.keywords.value="请输入您感兴趣的产品名称！"; getObj('which').value="sale"; break;
		case 2:
		document.searchForm.keywords.value="请输入您感兴趣的产品名称！"; getObj('which').value="buy"; break;
		case 3:
		document.searchForm.keywords.value="请输入您感兴趣的产品名称！"; getObj('which').value="productshow";break;
		case 4:
		document.searchForm.keywords.value="请输入产品或公司名称！"; getObj('which').value="corporation";break;
		case 5:
		document.searchForm.keywords.value="请输入您感兴趣的资讯关键字！"; getObj('which').value="news";break;
		case 6:
		document.searchForm.keywords.value="请输入您感兴趣的展会关键字！"; getObj('which').value="exhi";break;
		
	}
}
else{
document.getElementById("searchForm").keywords.value = keywords;
switch(id){
		case 1:
		 getObj('which').value="sale";;
		break;
		case 2:
		 getObj('which').value="buy"; break;
		case 3:
		 getObj('which').value="productshow";break;
		case 4:
		  getObj('which').value="corporation"; break;
		 case 5:
		 getObj('which').value="news";break;
		 case 6:
		 getObj('which').value="exhi";break;
		 
		 
		 	}
}
	
}

	
function chk_search()
{
	if (document.searchForm.keywords.value.substring(0,3) =="请输入" || document.searchForm.keywords.value=="")
	{
		alert("请输入查询内容！");
		document.searchForm.keywords.focus();
		return (false);
	}
	}