function increment(fld, e)
{   
    fld.value = parseFloat(fld.value) + 1;
    return false;
}

var orizinalSize; // global variable to store the original size of the dropdown
function increaseSize(ddl)
{
    orizinalSize = ddl.style.width;
    ddl.style.width = "200 px"; //specify new size 
}
function decreaseSize(ddl)
{
    ddl.style.width = orizinalSize;
}