ADD/REMOVE tr table with select box

select box didn't work

HTML

<table class="dynatable" align='center' id='dynatable' border='1'>
                        <thead>
                            <tr>
                                <th width='500px' colspan='2'>Window Type</th>
                                <th><button class="add">Add</button></th>
                            </tr>
                        </thead>
                        <tbody>
                            <tr class="prototype">
                                <td width='5px'>
                                    <span class='num'>1</span>
                                </td>
                                <td>
                                <input type="checkbox" name="checkbox[]" value="0" class="id" id='checkbox'  checked/>
                                <select name='prod_type[]' class='tech' style='width:300px;'>   
                                    <option value='' data-description="Select Window/Door"></option><option value='Sample1' data-image="" data-description="This is sample 1">
                                            Sample 1
                                      </option><option value='Sample2' data-image="" data-description="This is sample 2">
                                            Sample 2
                                      </option><option value='Sample 3' data-image="" data-description="This is sample 3">
                                            Sample 3
                                      </select>                             

                                </td>
                                <td>
                                    <button class="remove">X</button>
                                </td>
                            </tr>
</table>

CSS

.dynatable .prototype {
				display:'';
			}


/* for ms Dropdown*/
.borderRadius{-moz-border-radius:5px; border-radius:5px; }
.borderRadiusTp{-moz-border-radius:5px 5px 0 0; border-radius:5px 5px 0 0;}
.borderRadiusBtm{-moz-border-radius:0 0 5px 5px ; border-radius:0 0 5px 5px;}

.ddcommon {position:relative;display:-moz-inline-stack; zoom:1; display:inline-block; *display:inline; cursor:default;}
.ddcommon ul{padding:0;margin:0;}
.ddcommon ul li{list-style-type:none;}
.borderRadiusTp ul li:last-child{-moz-border-radius:0 0 5px 5px ; border-radius:0 0 5px 5px;border-bottom:0 none #c3c3c3; }
.borderRadiusBtm ul li:first-child{-moz-border-radius:5px 5px 0 0; border-radius:5px 5px 0 0 ;border-bottom:1 solid #c3c3c3; }

.ddcommon .disabled img, .ddcommon .disabled span, .ddcommon.disabledAll{
opacity: .5; /* standard: ff gt 1.5, opera, safari */
-ms-filter:"alpha(opacity=50)"; /* ie 8 */
filter:alpha(opacity=50); /* ie lt 7 */
-khtml-opacity:.5; /* safari 1.x */
-moz-opacity:.5; /* ff lt 1.5, netscape */
color:#999999;
}
.ddcommon .clear{clear:both}
.ddcommon .shadow{-moz-box-shadow:5px 5px 5px -5px #888888;-webkit-box-shadow:5px 5px 5px -5px #888888;box-shadow: 5px 5px 5px -5px #888888;}
.ddcommon input.text{color:#7e7e7e;padding:0 0 0 0; position:absolute; background:#fff; display:block; width:98%; height:98%; left:2px; top:0; border:none;}
.ddOutOfVision{position:relative; display:-moz-inline-stack; display:inline-block; zoom:1; *display:inline;}
.borderRadius .shadow{-moz-box-shadow:5px 5px 5px -5px #888888;-webkit-box-shadow:5px 5px 5px -5px #888888;box-shadow: 5px 5px 5px -5px #888888;}
.borderRadiusBtm .shadow{-moz-box-shadow:-5px -5px 5px -5px #888888;-webkit-box-shadow:-5px -5px 5px -5px #888888;box-shadow: -5px -5px 5px -5px #888888}
.borderRadiusTp .border, .borderRadius .border{-moz-border-radius:0 0 5px 5px ; border-radius:0 0 5px 5px;}
.borderRadiusBtm .border{-moz-border-radius:5px 5px 0 0; border-radius:5px 5px 0 0;}
img.fnone{float:none...

JavaScript

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