Menu (level 2 menu)

Level 1 menu, div ID is Mian (I) Note: I is a number;

Level 2 menu, div ID is child (I) Note: I is a number

The target property is the name of the property corresponding to the <IFRAME> tag, which is displayed in the <IFRAME> container on the./zy-dzsw.html page.

<A href = "#">
<Div id = "main1" style = "color: Blue" onclick = "document. All. child1.style. Display = (document. All. child1.style. Display = 'None ')? '': 'None'"> Institute of Economics and Trade </div> </a>
<Div id = "Child1" style = "display: none;">
<A href = "./zy-dzsw.html" target = "zynr"> E-Commerce </a> <br>
<A href = "./zy-scyx.html" target = "zynr"> marketing </a> <br>
<A href = "#"> international trade practices </a> <br>
</Div>

<A href = "#"> <Div id = "main2" style = "color: Blue" onclick = "document. all. child2.style. display = (document. all. child2.style. display = 'None ')? '': 'None'"> School of transportation and information </div> </a>
<Div id = "child2" style = "display: none;">
<A href = "#"> Computer Network Technology </a> <br>
<A href = "#"> Mobile Communication </a> <br>
<A href = "#"> Computer System Maintenance </a> <br>
</Div>
<A href = "#"> <Div id = "main3" style = "color: blue"

Onclick = "document. All. child4.style. Display = (document. All. child4.style. Display = 'None ')? '': 'None'"> College of bioengineering </div> </a>
<Div id = "Child4" style = "display: none;">
<A href = "#"> animal husbandry </a> <br>
<A href = "#"> gardening technology </a> <br>
</Div>
</Div>

Menu (level 2 menu)