Clearing the textbox values onclick and displaying onblur

HTML:

<input type="text" value="" onClick="Clear();" id="textbox1>

Javascript :

function Clear()
{    
   document.getElementById("textbox1").value= "";
  
}

function keephere(){    
   document.getElementById("textbox1").value= "name";
  
}

 <input type="text" ... onkeyup="JavaScript: Clear()" 

onmouseup="JavaScript: keephere()" >