I have following script registered on page load:

```
    ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "watermark", "function WaterMark(txtWaterMark, event,text) { if (txtWaterMark.value.length > 0 && event.type == 'mouseover') {txtWaterMark.style.color = '#c6c1c1'; if(txtWaterMark.value == text) {txtWaterMark.value = text;} } if (txtWaterMark.value.length > 0 && event.type == 'mouseout') {txtWaterMark.style.color = 'gray';if (txtWaterMark.value.length == 0){txtWaterMark.value = text;} } if (event.type == 'focus' ) {alert(txtWaterMark.value); if(txtWaterMark.value == text){txtWaterMark.value = '';} } }", true);

```

Can I create this function in aspx and register in cs ?