html 利用網址列尾端帶參數轉傳變數值

  
 window.open('showsearch.php?context='+searcha.value, "newwindow", "height=600, width=500, toolbar =no, menubar=no, scrollbars=no, resizable=no, location=no, status=no");
//javascript把windows open之後帶參數   ?context= xxxxxx ;  再送給下一個windows

//searcha是欄位或字串框名   name=searcha