Net webform to get the server control,js script to get the server control needs to use ClientID

Web foreground acquisition control: < % % = TextBox1. The ClientID > The control ID for TextBox1 is printed Get the webform control in the js script :(implements the control to become red when the mouse moves over it)

<script type="text/javascript">
function myFuntion()
{
document.getElementById('<%=TextBox1.ClientID %>').onmouseover=function(){
this.style.background='red';
}
}
</script>