function placehoder(){
	if(Jtrim(document.searchform.keys.value)==''){
		window.alert ("ÇëÊäÈëËÑË÷¹Ø¼ü´Ê£¡");
		document.searchform.keys.focus();
		return false;
	} 
	var keyword=document.searchform.keys.value;
	if(Jtrim(document.searchform.search.value)=='trade'){
		document.searchform.action="../trade/search.jsp?keys="+keyword;
	}else if(Jtrim(document.searchform.search.value)=='product'){
		document.searchform.action="../product/search.jsp?keys="+keyword;
	}else if(Jtrim(document.searchform.search.value)=='company'){
		document.searchform.action="../company/search.jsp?keys="+keyword;
	}else if(Jtrim(document.searchform.search.value)=='news'){
		document.searchform.action="../news/search.jsp?keys="+keyword;
	}else if(Jtrim(document.searchform.search.value)=='expo'){
		document.searchform.action="../exhibition/list.jsp?keyword="+keyword;
	}
	return true
}