function demandsrch(frm){
	
	var wd = frm.txtWd.value.Trim();
	if(wd==""||wd=="请输入关键字"){
		alert("请输入搜索关键字！");
		frm.txtWd.focus();
		return;
	}

	var realm = frm.selRealm.value;
	var time = frm.selTime.value;
 	var _form = document.createElement("form");

 	for (var i=0;i < frm.chkType.length;i++){
	    if (frm.chkType[i].checked){
	       var srchTp = frm.chkType[i].value;break;
	    }
 	}
 	if(srchTp=='1'){
 		_form.action="../trade/srchsupply.php";
 	}else{
 		_form.action="../trade/srchdemand.php";
 	}
    _form.method="get";
    _form.target="_blank";
    
    document.body.appendChild(_form);
    
    var txtTime = document.createElement("input"); 
    txtTime.type="hidden"; 
    txtTime.name="t"; 
    txtTime.value=time; 
    
    var txtRealm = document.createElement("input"); 
    txtRealm.type="hidden"; 
    txtRealm.name="r"; 
    txtRealm.value=realm; 
    
    var txtWd = document.createElement("input"); 
    txtWd.type="hidden"; 
    txtWd.name="wd"; 
    txtWd.value=escape(wd); 
    
    _form.appendChild(txtTime);
    _form.appendChild(txtRealm);
    _form.appendChild(txtWd);
    _form.submit(); 
}