function show_picture(id)
{
	url = "showpicture.php?product_id="+id;
	window.open(url, "Form", 'toolbar=0,scrollbars=0,location=0,statusbar=0,menubar=0,resizable=0,width=449,height=431,left = 185,top = 50');
}

var cleared = new Array() ;
function focusText( input ) {
    var found = false ;
    for ( var i = 0 ; i < cleared.length ; i++ ) {
        if ( cleared[ i ] == input ) {
            found = true ;
            break ;
        }
    }
    if ( !found ) {
        input.value = "" ;
        cleared[ cleared.length ] = input ;
    }
}