var groupClass;

function myGetElementByClass(classname)	// Get all Html elements belonging to particular 'class'
{
    groupClass	= new Array();
    var ind=0;
    var allTags = (document.all)?document.all:document.getElementsByTagName("*");
    for (i=0;i<allTags.length;i++)
    {
    	if (allTags[i].className == classname)
	    {
    	   groupClass[ind++] = allTags[i];
	    }
    }
}
	

function togClass(classname, option)	// Hide or Display html elements of a specific 'Class'
{
    myGetElementByClass(classname);
    var display_value;
    if (option)
    {
        display_value   = 'block';
    }
    else
    {
        display_value   = 'none';
    }
        
    for ( j=0; j<groupClass.length;j++)
    {
    	groupClass[j].style.display = display_value;
    }
}

function hideId(id)
{
    var element = document.getElementById(id);
    element.style.display        = 'none';

}

function viewId(id)
{
    var element = document.getElementById(id);
    element.style.display        = 'block';
}