function processPrevious(trgt,inc) {
        if (!document.getElementById) return
        var d = document,cEl = null,sz = startSz,i,j,cTags;
        
        sz += inc;
        if ( sz < 0 ) sz = 0;
        if ( sz > 6 ) sz = 6;
        startSz = sz;
        
        if ( !( cEl = d.getElementById( trgt ) ) ) cEl = d.getElementsByTagName( trgt )[ 0 ];
        
        cEl.style.fontSize = szs[ sz ];
        
        for ( i = 0 ; i < tgs.length ; i++ ) {
        cTags = cEl.getElementsByTagName( tgs[ i ] );
        for ( j = 0 ; j < cTags.length ; j++ ) cTags[ j ].style.fontSize = szs[ sz ];
        }
    }
    
    function processNext(trgt,inc) {
        if (!document.getElementById) return
        var d = document,cEl = null,sz = startSz,i,j,cTags;
        
        sz += inc;
        if ( sz < 0 ) sz = 0;
        if ( sz > 6 ) sz = 6;
        startSz = sz;
        
        if ( !( cEl = d.getElementById( trgt ) ) ) cEl = d.getElementsByTagName( trgt )[ 0 ];
        
        cEl.style.fontSize = szs[ sz ];
        
        for ( i = 0 ; i < tgs.length ; i++ ) {
        cTags = cEl.getElementsByTagName( tgs[ i ] );
        for ( j = 0 ; j < cTags.length ; j++ ) cTags[ j ].style.fontSize = szs[ sz ];
        }
    }
    
    //Specify affected tags. Add or remove from list:
    var tgs = new Array( 'div','td','tr','li','ul', 'span','a');
    
    //Specify spectrum of different font sizes:
    var szs = new Array( '11px','12px','13px','14px','15px','16px','17px' );
    var startSz = 2;