Change div Pro

function ChangeBackgroundcolor(layer)
{

var myLayer = document.getElementById(layer).style.background;
//alert(myLayer);
if(myLayer == "#ffff66")
{
document.getElementById(layer).style.background = "#0000ff";
//alert("sss");
}
else
{
//alert("sss");
document.getElementById(layer).style.background = "#ffff66";
}
}
/* ---------------------------- */
function ChangeHight(layer)
{
var myLayer = document.getElementById(layer).style.height;
//alert(myLayer);
if(myLayer == "20px")
{
document.getElementById(layer).style.height = "200px";
}
else
{
document.getElementById(layer).style.height = "20px";
}
}
/* ---------------------------- */
function ChangeWidth(layer)
{
var myLayer = document.getElementById(layer).style.width
//alert(myLayer);
if(myLayer == "40px")
{
document.getElementById(layer).style.width ="400px"
}
else
{
document.getElementById(layer).style.width ="40px"
}

}

function ChangeClass(layer)
{
var myLayer = document.getElementById(layer).className;
//alert(myLayer);
if(myLayer == "style1")
{
document.getElementById(layer).className ="style2"
}
else
{
document.getElementById(layer).className ="style1"
}

}