how to write the code for onmouse over event for multiple buttons

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.NET

.NET4

my requirements is..
am using 3 buttons if i put the mouse any butoon it will change the color so how to write code for all buttons

i write this code for my application

function color(x)
{
if(x==1){
var a = document.getElementById("<=button1.ClientId%>");
 a.style.BackgroundColor="#####";
}
if(x==2)
{ 
var b=document.getElementById("<button1.ClientId%>");
 b.style.Backgroundcolor="######";
}
}