var min_num = 1;  

var max_num = 4;  

var diff = max_num-min_num+1 ;  

var rnd_number=1; 

var scroltxt = new Array(4); 

scroltxt[1]="scroltxt1.htm"; 

scroltxt[2]="scroltxt2.htm"; 

scroltxt[3]="scroltxt3.htm"; 

scroltxt[4]="scroltxt4.htm"; 

rnd_number=Math.floor(Math.random()*diff + min_num);  

document.write('<iframe id="datamain" src="'+scroltxt[rnd_number]+'" width="270px" height="298px" marginwidth="0" marginheight="0" hspace="0" vspace="0" frameborder="1" scrolling="no"></iframe>')
//scroltxt[4]="newyearwish.htm";