function changeSrc1()
{
document.getElementById("myImage").src="index_files/valentine_one_1.jpg";
}
function changeSrc2()
{
document.getElementById("myImage").src="index_files/valentine_one_2.jpg";
}
function changeSrc3()
{
document.getElementById("myImage").src="index_files/valentine_one_3.jpg";
}

function changeSrc4()
{
document.getElementById("myImage").src="index_files/valentine_one_4.jpg";
}