Dynamicdeezign, documentation of html and css
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<select> : option selector
The SELECT element creates a menu. Each choice offered by the menu is represented by an OPTION element. A SELECT element must contain at least one OPTION element.
-) name
This attribute assigns the control name.
-) size
If a SELECT element is presented as a scrolled list box, this attribute specifies the number of rows in the list that should be visible at the same time. Visual user agents are not required to present a SELECT element as a list box; they may use any other mechanism, such as a drop-down menu.
-) multiple
If set, this boolean attribute allows multiple selections. If not set, the SELECT element only permits single selections.


<select name="names_sel">


For complete reference see html reference at W3C