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Code
<input type="text" size="20" maxlength="55" name="qt" class="bodytext"
onfocus="if( this.value==this.defaultValue ) this.value='';" onblur="if( this.value=='' ) this.value=this.defaultValue;" value="搜索">
<input type="button" name="btn" onclick="btnChlic(qt.value);" value="确定"/>