document.write("<option value='TCL'>TCL</option>");
document.write("<option value='方正'>方正</option>");
document.write("<option value='宏碁'>宏碁</option>");
document.write("<option value='惠普(HP)'>惠普(HP)</option>");
document.write("<option value='联想'>联想</option>");
document.write("<option value='明基'>明基</option>");
document.write("<option value='七喜'>七喜</option>");
document.write("<option value='中天星'>中天星</option>");