function DisplayBig(current)
{
document.getElementById('img_main').src=current.src;
}
function ShowBig(current)
{
if(current.width==290)
{
current.width = 750;
current.height = 450;
current.style.position = "absolute";
}
else
{
current.style.position = "relative";
current.width=290;
current.height=192;
}
}