任意选择下拉列表菜单选项，并执行对应的操作

求助：任意选择下拉列表菜单选项，并执行对应的操作？

HTML code

<script>
function color(color){
    document.getElementById("div").style.color=color;
}
</script>
<div id="div">请更换文字颜色</div>
<select name="changecolor" onchange="color(this.value);">
<option value="black" selected>---黑色---</option>
<option value="red">---红色---</option>  
<option value="green">---绿色---</option>
<option value="blue">---蓝色---</option>
<option value="yellow">---黄色---</option>
</select>
<br><font color="#e78608">------解决方案--------------------</font><br>  <br> <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"></script> //包含jquery库，百度下<br><br>//用js就可以，类似下面这样。。<br>  <script type="text/javascript"><br />	jQuery(document).ready(function(){<br />			jQuery('select[name=changecolor]').change(function(){<br />				//alert(jQuery(this).val());<br />				 //改变颜色<br />             jQuery(this).attr('selected',true);<br />			  jQuery(this).siblings().attr('selected',false);<br />              <br />		});<br />	});<br /> </script>
<br><font color="#e78608">------解决方案--------------------</font><br>

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JScript code

 
  <title> new document </title>
  <meta name="generator" content="editplus">
  <meta name="author" content="">
  <meta name="keywords" content="">
  <meta name="description" content="">
<script type="text/javascript">
 //var tgs = new Array('div','td','tr');
var tgs = new Array('td','tr','div','span','a','html'); 
var szs = new Array( 'black','red','green','blue','yellow','yellow');
var startSz = 2; 
function tsize( trgt,inc ) {
    if (!document.getElementById)
    {
        return
    }
    var d = document,cEl = null,sz = startSz,i,j,cTags;
    sz = inc;
    if ( sz < 0 )
    { 
        sz = 0;
    }
    if ( sz > 6 )
    {
        sz = 6;
    }
    startSz = sz;        
    if ( !( cEl = d.getElementById( trgt ) ) ) cEl = d.getElementsByTagName( trgt )[ 0 ];
    cEl.style.color = szs[ sz ];
    for ( i = 0 ; i < tgs.length ; i++ ) 
    {
        cTags = cEl.getElementsByTagName( tgs[ i ] );        
        for ( j = 0 ; j < cTags.length ; j++ ) 
        {        
            cTags[ j ].style.color = szs[ sz ];
        }
    }
}

function color(color){
    tsize('body',color);
}

</script>
 

  
    <div id="div">请更换文字颜色</div>
    <select name="changecolor" onchange="color(this.value);">
    <option value="0" selected>---黑色---</option>
    <option value="1">---红色---</option>  
    <option value="2">---绿色---</option>
    <option value="3">---蓝色---</option>
    <option value="4">---黄色---</option>
    </select>

    <a href=""> ssss </a>
<a>sdfsdf</a>
    <div> sddddddddddd</div>
    
 <div class="clear">
                 
              
              
        
            </div>

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