function check_form(field)
{
	var i;
	for (i = 1; i < 4; i++)
	{
		val1='sel' +i;
	    if(val1!=field.name)
	    {
	    	if (field.value==' ')
	        document.search.elements[val1].disabled=false;
	        else
	        document.search.elements[val1].disabled=true;
	    }

	}
}

function SendForm()
{
	counter = document.search.elements['sel1'].length;

    for(var i=0; i<counter; i++)
    {
    	if(document.search.elements['sel1'].options[i].selected)
        {
        	url = document.search.elements['sel1'].options[i].value;
            window.location = 'http://'+url;
        }
    }

    return false;
}